diff --git a/.ccls b/.ccls
index 814530d..aa8c065 100644
--- a/.ccls
+++ b/.ccls
@@ -1,3 +1,2 @@
 clang
-%h -x c++-header
 -I/otherhome/john/Amiga/Development/NDKs/3.9/Include/include_h
diff --git a/.gitignore b/.gitignore
index 9773373..e41400e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,7 @@ activate
 *.lnk
 *.uaem
 .ccls-cache/
+*.lib
+.ccls
+ccls.log
+cutest
diff --git a/blitter_speed_test b/blitter_speed_test
new file mode 100755
index 0000000..d76f104
Binary files /dev/null and b/blitter_speed_test differ
diff --git a/blitter_speed_test.c b/blitter_speed_test.c
new file mode 100644
index 0000000..0942e08
--- /dev/null
+++ b/blitter_speed_test.c
@@ -0,0 +1,118 @@
+#include <clib/exec_protos.h>
+#include <clib/intuition_protos.h>
+#include <clib/graphics_protos.h>
+#include <graphics/gfxbase.h>
+#include <hardware/custom.h>
+#include <hardware/dmabits.h>
+#include <exec/memory.h>
+
+#include <time.h>
+#include <stdio.h>
+
+extern struct GfxBase *GfxBase;
+extern far struct Custom custom;
+
+#define COPIES (100)
+
+int main(void) {
+  // reserve two 320x200 bitplanes
+  // take over the system
+  // for 1000 loops
+  // * run blitter copies, setting up new registers each time
+  // * do CPU copies
+  // give the system back
+  // print the timings of each
+
+  struct View *OldView;
+  ULONG OldCopper;
+  UWORD OldDMACON, OldINTENA, OldINTREQ, OldADKCON;
+  unsigned int startTime[2], blitTime[2], copyTime[2];
+
+  unsigned char *source, *target, check;
+
+  ULONG blitTimeFinal, copyTimeFinal;
+
+  int i, j;
+
+  OldView = ((struct GfxBase *)GfxBase)->ActiView;
+  OldCopper = (ULONG)((struct GfxBase *)GfxBase)->copinit;
+
+  LoadView(NULL);
+  WaitTOF();
+  WaitTOF();
+  OwnBlitter();
+  WaitBlit();
+  Forbid();
+
+  OldDMACON = custom.dmaconr | 0x8000;
+  OldINTENA = custom.intenar | 0x8000;
+  OldINTREQ = custom.intreqr | 0x8000;
+  OldADKCON = custom.adkconr | 0x8000;
+
+  custom.dmacon = DMAF_SETCLR | DMAF_BLITTER;
+  custom.dmacon = DMAF_AUDIO | DMAF_DISK | DMAF_SPRITE | DMAF_COPPER | DMAF_RASTER;
+
+  source = AllocMem(320 * 200 / 8, MEMF_CHIP | MEMF_CLEAR);
+  target = AllocMem(320 * 200 / 8, MEMF_CHIP | MEMF_CLEAR);
+
+  *(source) = 1;
+
+  timer(startTime);
+
+  for (i = 0; i < COPIES; ++i) {
+    // a and d
+    custom.bltcon0 = (1 << 8) + (1 << 11);
+    custom.bltcon1 = 0;
+    custom.bltapt = source;
+    custom.bltdpt = target;
+    custom.bltamod = 0;
+    custom.bltdmod = 0;
+    custom.bltsize = (320 / 16) + (200 << 6);
+
+    WaitBlit();
+  }
+
+  timer(blitTime);
+
+  for (i = 0; i < COPIES; ++i) {
+    for (j = 0; j < (320 * 200 / 8); ++j) {
+      target[j] = source[j];
+    }
+  }
+
+  timer(copyTime);
+
+  check = *(source);
+
+  FreeMem(source, 320 * 200 / 8);
+  FreeMem(target, 320 * 200 / 8);
+
+  custom.dmacon = 0x7FFF;
+  custom.dmacon = OldDMACON;
+
+  custom.intena = 0x7FFF;
+  custom.intena = OldINTENA;
+
+  custom.intreq = 0x7FFF;
+  custom.intreq = OldINTREQ;
+
+  custom.adkcon = 0x7FFF;
+  custom.adkcon = OldADKCON;
+
+  custom.cop1lc = OldCopper;
+  LoadView(OldView);
+  WaitTOF();
+  WaitTOF();
+  WaitBlit();
+  DisownBlitter();
+  Permit();
+
+  blitTimeFinal = (blitTime[0] - startTime[0]) * 1000000 + (blitTime[1] - startTime[1]);
+  copyTimeFinal = (copyTime[0] - blitTime[0]) * 1000000 + (copyTime[1] - blitTime[1]);
+
+  printf("Number of 320x200/8 copies: %d\n", COPIES);
+  printf("Blitter (microsecond): %d\n", blitTimeFinal);
+  printf("CPU (microsecond):     %d\n", copyTimeFinal);
+
+  return 0;
+}
diff --git a/blitter_test b/blitter_test
new file mode 100755
index 0000000..0209481
Binary files /dev/null and b/blitter_test differ
diff --git a/blitter_test.c b/blitter_test.c
new file mode 100644
index 0000000..ccc5a49
--- /dev/null
+++ b/blitter_test.c
@@ -0,0 +1,316 @@
+#include <stdio.h>
+
+#include "blitter.h"
+#include "cutest/CuTest.h"
+
+struct BlitAreaDetails blitAreaDetails;
+
+void TMarquee_ZeroOnWordEdges(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    0,
+    0,
+    207,
+    7,
+    0,
+    8
+  );
+
+  // no shift
+  CuAssertIntEquals(tc, 0, blitGenericData.shift);
+
+  // only need 13 words
+  CuAssertIntEquals(tc, 26, blitGenericData.width);
+
+  // right side has no shift so it will be treated as ascending
+  CuAssertIntEquals(tc, 0, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 0, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.lastWordMask);
+}
+
+void TMarquee_ZeroOnePixelOver(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    0,
+    0,
+    208,
+    7,
+    0,
+    8
+  );
+
+  // no shift
+  CuAssertIntEquals(tc, 0, blitGenericData.shift);
+
+  // we ned 14 words because of an extra pixel
+  CuAssertIntEquals(tc, 28, blitGenericData.width);
+
+  // right side has no shift so it will be treated as ascending
+  CuAssertIntEquals(tc, 0, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 0, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0x8000, blitGenericData.lastWordMask);
+}
+
+void TMarquee_ZeroOnePixelUnder(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    0,
+    0,
+    206,
+    7,
+    0,
+    8
+  );
+
+  // no shift
+  CuAssertIntEquals(tc, 0, blitGenericData.shift);
+
+  // 13 words
+  CuAssertIntEquals(tc, 26, blitGenericData.width);
+
+  // right side has no shift so it will be treated as ascending
+  CuAssertIntEquals(tc, 0, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 0, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0xfffe, blitGenericData.lastWordMask);
+}
+
+void TMarquee_LeftOneOnePixelUnder(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    1,
+    0,
+    207,
+    7,
+    0,
+    8
+  );
+
+  // a left shift of 1 on the right side
+  CuAssertIntEquals(tc, -1, blitGenericData.shift);
+
+  // 13 words
+  CuAssertIntEquals(tc, 26, blitGenericData.width);
+
+  // this is descending now
+  CuAssertIntEquals(tc, 24, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 24, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0x7fff, blitGenericData.lastWordMask);
+}
+
+void TMarquee_MoveRightOnePixel(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    0,
+    0,
+    207,
+    7,
+    1,
+    8
+  );
+
+  // a right shift of 1 on the right side
+  CuAssertIntEquals(tc, 1, blitGenericData.shift);
+
+  // 14 words
+  CuAssertIntEquals(tc, 28, blitGenericData.width);
+
+  // ascending
+  CuAssertIntEquals(tc, 0, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 0, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0x0000, blitGenericData.lastWordMask);
+}
+
+void TMarquee_MoveRight16Px(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    0,
+    0,
+    207,
+    7,
+    16,
+    8
+  );
+
+  // no shift
+  CuAssertIntEquals(tc, 0, blitGenericData.shift);
+
+  // 13 words
+  CuAssertIntEquals(tc, 26, blitGenericData.width);
+
+  // ascending
+  CuAssertIntEquals(tc, 0, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 2, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.lastWordMask);
+}
+
+void TMarquee_MoveRight8Px(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    0,
+    0,
+    207,
+    7,
+    8,
+    8
+  );
+
+  // shift 8
+  CuAssertIntEquals(tc, 8, blitGenericData.shift);
+
+  // 14 words
+  CuAssertIntEquals(tc, 28, blitGenericData.width);
+
+  // ascending
+  CuAssertIntEquals(tc, 0, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 0, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xffff, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0x0000, blitGenericData.lastWordMask);
+}
+
+void TMarquee_ClipLeft10Px(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    40,
+    0,
+    112,
+    7,
+    0,
+    8
+  );
+
+  CuAssertIntEquals(tc, -2, blitGenericData.shift);
+
+  // 10 words
+  CuAssertIntEquals(tc, 14, blitGenericData.width);
+
+  // descending
+  CuAssertIntEquals(tc, 12, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 12, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0x8000, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0x3fff, blitGenericData.lastWordMask);
+}
+
+
+void TMarquee_ClipLeft20Px(CuTest *tc) {
+  struct BlitGenericData blitGenericData;
+
+  blitAreaDetails.drawAreaWidth = 320;
+  blitAreaDetails.target = 0;
+
+  blit_buildGenericBlitData(
+    &blitAreaDetails,
+    &blitGenericData,
+    20,
+    0,
+    99,
+    7,
+    0,
+    8
+  );
+
+  // shift -4
+  CuAssertIntEquals(tc, -4, blitGenericData.shift);
+
+  // 10 words + shift
+  CuAssertIntEquals(tc, 10, blitGenericData.width);
+
+  // descending
+  CuAssertIntEquals(tc, 12, blitGenericData.wordSource);
+  CuAssertIntEquals(tc, 8, blitGenericData.wordTarget);
+
+  CuAssertIntEquals(tc, 0xf000, blitGenericData.firstWordMask);
+  CuAssertIntEquals(tc, 0x0fff, blitGenericData.lastWordMask);
+}
+
+CuSuite *BlitterSuite() {
+  CuSuite *suite = CuSuiteNew();
+  /*
+  SUITE_ADD_TEST(suite, TMarquee_ZeroOnWordEdges);
+  SUITE_ADD_TEST(suite, TMarquee_ZeroOnePixelOver);
+  SUITE_ADD_TEST(suite, TMarquee_ZeroOnePixelUnder);
+  SUITE_ADD_TEST(suite, TMarquee_LeftOneOnePixelUnder);
+  SUITE_ADD_TEST(suite, TMarquee_MoveRightOnePixel);
+  SUITE_ADD_TEST(suite, TMarquee_MoveRight16Px);
+  SUITE_ADD_TEST(suite, TMarquee_MoveRight8Px);
+  SUITE_ADD_TEST(suite, TMarquee_ClipLeft20Px);
+  */
+  SUITE_ADD_TEST(suite, TMarquee_ClipLeft10Px);
+
+  return suite;
+}
+
+int main(void) {
+  CuString *output = CuStringNew();
+  CuSuite *suite = CuSuiteNew();
+
+  CuSuiteAddSuite(suite, BlitterSuite());
+
+  CuSuiteRun(suite);
+  CuSuiteSummary(suite, output);
+  CuSuiteDetails(suite, output);
+  printf("%s\n", output->buffer);
+
+  return 0;
+}
diff --git a/images.s b/images.s
new file mode 100644
index 0000000..cf0c8c5
--- /dev/null
+++ b/images.s
@@ -0,0 +1,4 @@
+  XDEF _coolbun
+
+_coolbun:
+  INCBIN "images/bun small.raw"
diff --git a/images/bun small.png b/images/bun small.png
new file mode 100644
index 0000000..7baf7f7
Binary files /dev/null and b/images/bun small.png differ
diff --git a/images/bun small.raw b/images/bun small.raw
new file mode 100644
index 0000000..8e404e1
Binary files /dev/null and b/images/bun small.raw differ
diff --git a/images/bun.png b/images/bun.png
new file mode 100644
index 0000000..19bf5eb
Binary files /dev/null and b/images/bun.png differ
diff --git a/main b/main
index 5695407..0235b98 100755
Binary files a/main and b/main differ
diff --git a/main.c b/main.c
index 67a4718..4d0ef5a 100644
--- a/main.c
+++ b/main.c
@@ -7,6 +7,8 @@
 #include <hardware/custom.h>
 #include <hardware/dmabits.h>
 
+#include <graphics/gfx.h>
+
 #include "blitter.h"
 #include "copper.h"
 #include "screen.h"
@@ -14,6 +16,7 @@
 #include "system.h"
 
 extern struct Custom far custom;
+extern unsigned char far coolbun[];
 
 void writeSomethingToScreen(struct ScreenSetup *screenSetup) {
   *(screenSetup->memoryStart) = 255;
@@ -22,36 +25,246 @@ void writeSomethingToScreen(struct ScreenSetup *screenSetup) {
   *(screenSetup->memoryStart + SCREEN_WIDTH * SCREEN_HEIGHT / 8 + 4) = 255;
 }
 
+// [ ] increase the size of the bun area
+// [ ] ensure the area has the correct data
+// [ ] fix existing edge writes to work
+// [ ] change non-edge write to use only bun area
+
+#define COOL_BUN_WIDTH (32)
+#define COOL_BUN_WIDTH_BYTES (COOL_BUN_WIDTH / 8)
+#define COOL_BUN_HEIGHT (32)
+#define COOL_BUN_PLANES (2)
+
+#define COOL_BUN_PLANE_SIZE (COOL_BUN_WIDTH_BYTES * COOL_BUN_HEIGHT)
+#define COOL_BUN_MEMORY_SIZE (COOL_BUN_PLANE_SIZE * COOL_BUN_PLANES)
+
+// this should be large enough to hold one bitplane of the largest object
+// you are blitting, plus one additional word on each side
+#define SCRATCH_AREA_WIDTH_BYTES (8)
+#define SCRATCH_AREA_HEIGHT_ROWS (34)
+#define SCRATCH_AREA_MEMORY_SIZE (SCRATCH_AREA_WIDTH_BYTES * SCRATCH_AREA_HEIGHT_ROWS)
+
+volatile short *dbg = (volatile short *)0x100;
+
+unsigned char *coolbunArea;
+unsigned char *scratchArea;
+struct ScreenSetup screenSetup;
+
+void clearScratchArea() {
+  custom.bltcon0 = 0xf0 + (1 << 8);
+  custom.bltcon1 = 0;
+
+  custom.bltadat = 0x0000;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+
+  custom.bltdpt = scratchArea;
+
+  custom.bltamod = 0;
+  custom.bltdmod = 0;
+
+  custom.bltsize = (4) + (32 << 6);
+
+  WaitBlit();
+}
+
+void bun_offRightSide(int plusXValue, int y) {
+  uint8_t i, plane = 0;
+  uint8_t shift = plusXValue & 15;
+  uint8_t wordShift = (plusXValue >> 4);
+  uint16_t bltalwm;
+
+  for (plane = 0; plane < 2; ++plane) {
+    clearScratchArea();
+  // step 2: copy bun to scratch area that aligns right edge to word edge
+  // right shift so it's ascending.
+    custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (shift << 12);
+    custom.bltcon1 = (shift << 12);
+
+    custom.bltadat = 0xffff;
+    custom.bltafwm = 0xffff;
+
+    bltalwm = 0xffff;
+    for (i = 0; i < shift; ++i) {
+      bltalwm -= (1 << i);
+    }
+    custom.bltalwm = bltalwm;
+
+    custom.bltbpt = coolbunArea + (plane * COOL_BUN_WIDTH_BYTES * COOL_BUN_HEIGHT);
+    custom.bltdpt = scratchArea + 2 + (wordShift * 2);
+
+    custom.bltamod = 0;
+    custom.bltbmod = wordShift * 2;
+    custom.bltdmod = SCRATCH_AREA_WIDTH_BYTES - 4 + (wordShift * 2);
+
+    // TODO: [ ] handle a scroll larger than 16px
+    custom.bltsize = (2 - wordShift) + (32 << 6);
+
+    WaitBlit();
+
+    // step 3: copy the cropped bun image to the main screen, already left
+    // aligned and with no fear of wraparound
+    // since buns are the back layer, we shouldn't need to preserve the
+    // background, so no c channel needed.
+    //
+    // y repeats go here. all buns are x aligned for simplicity.
+    custom.bltcon0 = 0xf0 + (1 << 8) + (1 << 11);
+    custom.bltcon1 = 0;
+
+    custom.bltapt = scratchArea + 2 + (wordShift * 2);
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0xffff;
+    custom.bltdpt = screenSetup.memoryStart + 30 + (wordShift * 2) + (screenSetup.nextBitplaneAdvance * plane) + (screenSetup.width / 8 * y);
+
+    custom.bltamod = 4 + (wordShift * 2);
+    custom.bltdmod = (screenSetup.width / 8) - 4 + (wordShift * 2);
+
+    custom.bltsize = (2 - wordShift) + (32 << 6);
+
+    WaitBlit();
+  }
+}
+
+void bun_offLeftSide(int minusXValue, int y) {
+  unsigned char plane;
+  uint8_t shift = minusXValue & 15;
+  uint8_t wordShift = (minusXValue >> 4);
+  uint8_t i;
+  uint16_t bltalwm;
+  /**
+   * This is a three step process, repeated for each bitplane:
+   * 
+   * * clean out the scratch plane
+   * * copy the bun graphic shifted left so that the third blit...
+   * * can pick up just that area and stamp it down.
+   */
+
+  for (plane = 0; plane < 2; ++plane) {
+    // step 1: clear the scratch area
+    // no modifications here!
+    clearScratchArea();
+
+    // step 2: copy the bun image to the scratch area in a way that aligns
+    // the cutoff point to a word edge. this requires a left shift, so
+    // it's descending.
+    custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (shift << 12);
+    custom.bltcon1 = (1 << 1) + (shift << 12);
+
+    custom.bltadat = 0xffff;
+    custom.bltafwm = 0xffff;
+
+    bltalwm = 0xffff;
+    for (i = 0; i < shift; ++i) {
+      bltalwm -= (1 << (15 - i));
+    }
+    custom.bltalwm = bltalwm;
+
+    // TODO: [ ] handle a scroll larger than 16px
+    custom.bltbpt = coolbunArea + 2 + ((COOL_BUN_HEIGHT - 1) * COOL_BUN_WIDTH_BYTES) + (plane * COOL_BUN_WIDTH_BYTES * COOL_BUN_HEIGHT);
+    custom.bltdpt = scratchArea + 4 - (wordShift * 2) + ((COOL_BUN_HEIGHT - 1) * SCRATCH_AREA_WIDTH_BYTES);
+
+    custom.bltamod = 0;
+    custom.bltbmod = wordShift * 2;
+    custom.bltdmod = SCRATCH_AREA_WIDTH_BYTES - 4 + (wordShift * 2);
+
+    // TODO: [ ] handle a scroll larger than 16px
+    custom.bltsize = (2 - wordShift) + (32 << 6);
+
+    WaitBlit();
+
+    // step 3: copy the cropped bun image to the main screen, already left
+    // aligned and with no fear of wraparound
+    // since buns are the back layer, we shouldn't need to preserve the
+    // background, so no c channel needed.
+    //
+    // y repeats go here. all buns are x aligned for simplicity.
+    custom.bltcon0 = 0xf0 + (1 << 8) + (1 << 11);
+    custom.bltcon1 = 0;
+
+    custom.bltapt = scratchArea + 2;
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0xffff;
+    custom.bltdpt = screenSetup.memoryStart + (screenSetup.nextBitplaneAdvance * plane) + (screenSetup.width / 8 * y);
+
+    custom.bltamod = 4 + (wordShift * 2);
+    custom.bltdmod = (screenSetup.width / 8) - 4 + (wordShift * 2);
+
+    custom.bltsize = (2 - wordShift) + (32 << 6);
+
+    WaitBlit();
+  }
+}
+
+void bun_anywhere(int x, int y) {
+  uint8_t plane;
+  uint8_t shift = x & 15;
+  uint8_t needsExtraWord = shift != 0;
+
+  for (plane = 0; plane < 2; ++plane) {
+    // if we extend the bun area by a word, we only need one write
+
+    // buns will never interfere with a background so they don't need a mask
+    // they do need the scratch area though
+    custom.bltcon0 = 0xf0 + (1 << 8) + (1 << 11) + (shift << 12);
+    custom.bltcon1 = 0;
+
+    custom.bltapt = coolbunArea + (COOL_BUN_HEIGHT * COOL_BUN_WIDTH_BYTES * plane);
+    custom.bltdpt = scratchArea + 2;
+   // custom.bltdpt = screenSetup.memoryStart;
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0xffff;
+    custom.bltamod = 0;
+    custom.bltdmod = 4 - (needsExtraWord * 2);
+    custom.bltsize = (2 + needsExtraWord) + (32 << 6);
+
+    WaitBlit();
+
+    custom.bltcon0 = 0xf0 + (1 << 8) + (1 << 11);
+    custom.bltcon1 = 0;
+    custom.bltapt = scratchArea + 2;
+    custom.bltdpt = screenSetup.memoryStart + WORD_ALIGNED_BYTE_POSITION(screenSetup.width, x, y) + (screenSetup.nextBitplaneAdvance * plane);
+    custom.bltamod = 2;
+    custom.bltdmod = 40 - 6;
+    custom.bltsize = (3) + (32 << 6);
+
+    WaitBlit();
+  }
+}
+
 int main(void) {
-  struct ScreenSetup screenSetup;
   uint16_t *copperlist, *currentCopperlist;
-  int i, result;
+  int i, x, y, plane, result;
+  int blitShiftRight, memoryXOffset, blitWidth;
+
+  int bunPosition = -31;
+
   color_t colors[16];
 
-  struct BlitDrawLineSetup setup;
-  struct BlitAreaDetails blitAreaDetails, sourceBlitCopyDetails;
+  unsigned char *currentCoolBunArea, *currentCoolBun;
 
-  unsigned char *polygonScratchArea;
+  coolbunArea = AllocMem(COOL_BUN_MEMORY_SIZE, MEMF_CHIP | MEMF_CLEAR);
+  currentCoolBun = coolbun;
 
-  colors[0] = 0x0200;
-  colors[1] = 0x0f00;
-  colors[2] = 0x0f0f;
+  scratchArea = AllocMem(SCRATCH_AREA_MEMORY_SIZE, MEMF_CHIP | MEMF_CLEAR);
+
+  colors[0] = 0x09b8;
+  colors[1] = 0x0000;
+  colors[2] = 0x0fff;
   colors[3] = 0x000f;
 
   prepareScreen(&screenSetup, SCREEN_WIDTH, SCREEN_HEIGHT, 4);
   allocateScreenMemory(&screenSetup);
 
-  blit_fillAreaDetailsFromScreenSetup(
-    &screenSetup,
-    &blitAreaDetails
-  );
+  currentCoolBunArea = coolbunArea;
 
-  blit_fillAreaDetailsFromScreenSetup(
-    &screenSetup,
-    &sourceBlitCopyDetails
-  );
+  for (plane = 0; plane < COOL_BUN_PLANES; ++plane) {
+    for (y = 0; y < COOL_BUN_HEIGHT; ++y) {
+      for (x = 0; x < COOL_BUN_WIDTH_BYTES; ++x) {
+        *(currentCoolBunArea++) = *(currentCoolBun++);
+      }
+    }
+  }
 
-  polygonScratchArea = AllocMem(SCREEN_WIDTH * SCREEN_HEIGHT / 8, MEMF_CHIP | MEMF_CLEAR);
 
   // blitter copy the first bitplane row down to the second
 
@@ -66,33 +279,198 @@ int main(void) {
   currentCopperlist = addColorsToCopperlist(currentCopperlist, colors, 16);
   endCopperlist(currentCopperlist);
 
-  // blit a line to the scratch area
-  // blit the scratch area over
+  custom.bltcon0 = 0xc0 + (1 << 10) + (1 << 8);
+  custom.bltcon1 = (8 << 12);
+  custom.bltadat = 0xffff;
+  custom.bltafwm = 0x00ff;
+  custom.bltalwm = 0x0000;
+  custom.bltbpt = coolbunArea;
+  custom.bltdpt = screenSetup.memoryStart + (40 * 10 + 36);
+
+  custom.bltbmod = -2;
+  custom.bltdmod = 40 - 6;
+
+  custom.bltsize = (3) + (32 << 6);
+
+  WaitBlit();
+
+  custom.bltcon0 = 0xc0 + (1 << 10) + (1 << 8);
+  custom.bltcon1 = (15 << 12);
+  custom.bltadat = 0xffff;
+  custom.bltafwm = 0x0001;
+  custom.bltalwm = 0x0000;
+  custom.bltbpt = coolbunArea;
+  custom.bltdpt = screenSetup.memoryStart + (40 * 45 + 36);
+
+  custom.bltbmod = -2;
+  custom.bltdmod = 40 - 6;
+
+  custom.bltsize = (3) + (32 << 6);
+
+  WaitBlit();
+
+  custom.bltcon0 = 0xc0 + (1 << 10) + (1 << 8);
+  custom.bltcon1 = (8 << 12);
+  custom.bltadat = 0xffff;
+  custom.bltafwm = 0x00ff;
+  custom.bltalwm = 0x0000;
+  custom.bltbpt = coolbunArea;
+  custom.bltdpt = screenSetup.memoryStart + (40 * 80 + 38);
+
+  custom.bltbmod = 0;
+  custom.bltdmod = 40 - 4;
+
+  custom.bltsize = (2) + (32 << 6);
+
+  WaitBlit();
+  /*
+
+  for (bunPosition = -31; bunPosition < screenSetup.width + 31; ++bunPosition) {
+    for (plane = 0; plane < 2; ++plane) {
+      custom.bltcon0 = 0xf0 + (1 << 11);
+      custom.bltcon1 = 0;
+      custom.bltadat = 0x0000;
+      custom.bltdpt = screenSetup.memoryStart;
+      custom.bltafwm = 0xffff;
+      custom.bltalwm = 0xffff;
+      custom.bltsize = (20) + (256 << 6);
+      WaitBlit();
+    }
+
+    if (bunPosition < 0) {
+      //bun_offLeftSide(abs(bunPosition), 100);
+    } else if (bunPosition >= screenSetup.width) {
+      //bun_offRightSide(bunPosition - screenSetup.width - 1, 100);
+    } else {
+      bun_anywhere(bunPosition, 100);
+    }
+
+    WaitTOF();
+    WaitTOF();
+  }
+
 
   /*
-  blit_drawLine(&blitAreaDetails, &setup, 0, 0, 0, 40, 1);
-  blit_drawLine(&blitAreaDetails, &setup, 1, 0, 1, 40, 3);
-  blit_drawLine(&blitAreaDetails, &setup, 15, 0, 15, 40, 3);
-  */
-  //blit_drawLine(&blitAreaDetails, &setup, 16, 10, 16, 40, 3);
-  //blit_drawLine(&blitAreaDetails, &setup, 50, 10, 50, 40, 1);
-  //blit_drawLine(&blitAreaDetails, &setup, 79, 80, 79, 120, 3);
+  for (i = 0; i < 32; ++i) {
+    for (plane = 0; plane < 2; ++plane) {
+      custom.bltcon0 = 0xf0 + (1 << 8);
+      custom.bltcon1 = 0;
+      custom.bltadat = 0x0000;
+      custom.bltdpt = screenSetup.memoryStart;
+      custom.bltafwm = 0x0000;
+      custom.bltalwm = 0x0000;
+      custom.bltsize = (20) + (256 << 6);
+      WaitBlit();
+    }
 
-  blit_howDoesFWMandLWMWork(&blitAreaDetails);
+    bun_offLeftSide(i, 100);
+    bun_offRightSide(i, 100);
+
+    WaitTOF();
+    WaitTOF();
+  }
+
+  /*
+  // left shift this over 8 so it's "against the edge"
+  custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (1 << 11) + (0 << 12);
+  custom.bltcon1 = (1 << 1) + (0 << 12);
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltapt = coolbunScratchArea + 4 + (32 * 8);
+  custom.bltbpt = coolbunScratchArea + 4 + (31 * 8);
+  custom.bltdpt = screenSetup.memoryStart + 2 + (32 * 40);
+  custom.bltamod = -4;
+  custom.bltbmod = 4;
+  custom.bltdmod = 40 - 4;
+  custom.bltsize = (2) + (32 << 6);
 
   WaitBlit();
 
   /*
+  // left shift this over 8 so it's "against the edge"
+  custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (1 << 11) + (abs(x) << 12);
+  custom.bltcon1 = (1 << 1) + (abs(x) << 12);
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltapt = coolbunScratchArea + 2 + (32 * 8) + 4;
+  custom.bltbpt = coolbunScratchArea + 2 + 4 + (31 * 8);
+  custom.bltdpt = screenSetup.memoryStart + 4 + (31 * 40);
+  custom.bltamod = -6;
+  custom.bltbmod = 2;
+  custom.bltdmod = 40 - 6;
+  custom.bltsize = (1) + (32 << 6);
 
+  WaitBlit();
+*/
 
-  blit_copyOneToOne(
-    &blitAreaDetails,
-    &blitAreaDetails,
-    1, 0, 24, 16, 80, 80
-  );
+  WaitTOF();
+
+  /*
+  for (x = -15; x < 0; ++x) {
+    custom.bltcon0 = 0xf0 + (1 << 8);
+    custom.bltcon1 = 0;
+    custom.bltadat = 0xffff;
+
+    result = 0xffff;
+
+    for (i = 0; i < abs(x); ++i) {
+      result -= (1 << (15 - i));
+    }
+
+    custom.bltafwm = result;
+
+    custom.bltalwm = 0xffff;
+    custom.bltdpt = coolbunScratchArea + 2 + (32 * 8);
+    custom.bltsize = (2) + (1 << 6);
+
+    WaitBlit();
+
+    // left shift this over 8 so it's "against the edge"
+    custom.bltcon0 = 0xc0 + (1 << 8) + (1 << 10) + (1 << 11) + (abs(x) << 12);
+    custom.bltcon1 = (1 << 1) + (abs(x) << 12);
+    custom.bltafwm = 0xffff;
+    custom.bltalwm = 0xffff;
+    custom.bltapt = coolbunScratchArea + 2 + (32 * 8) + 4;
+    custom.bltbpt = coolbunScratchArea + 2 + 4 + (31 * 8);
+    custom.bltdpt = screenSetup.memoryStart + 4 + (31 * 40);
+    custom.bltamod = -6;
+    custom.bltbmod = 2;
+    custom.bltdmod = 40 - 6;
+    custom.bltsize = (3) + (32 << 6);
+
+    WaitBlit();
+
+    WaitTOF();
+  }
+
+  /*
+
+  for (x = 15; x < 17; ++x) {
+    for (plane = 0; plane < COOL_BUN_PLANES; ++plane) {
+      blitShiftRight = x & 15;
+      memoryXOffset = (x >> 3) & 0xfffe;
+
+      blitWidth = (blitShiftRight > 0) ? 6 : 4;
+
+      custom.bltcon0 = 0xf0 + (1 << 8) + (1 << 11) + (blitShiftRight << 12);
+      custom.bltcon1 = 0;
+      custom.bltapt = coolbunScratchArea + 2 + (COOL_BUN_PLANE_SIZE * plane);
+
+      custom.bltdpt = screenSetup.memoryStart + memoryXOffset + screenSetup.nextBitplaneAdvance * plane;
+      custom.bltafwm = 0xffff;
+      custom.bltalwm = 0xffff;
+      custom.bltamod = 8 - blitWidth;
+      custom.bltdmod = 40 - blitWidth;
+      custom.bltsize = (blitWidth / 2) + (32 << 6);
+
+      WaitBlit();
+    }
+
+    WaitTOF();
+  }
   */
 
-  for (i = 0; i < 200; ++i) {
+  for (i = 0; i < 100; ++i) {
     WaitTOF();
   }
 
@@ -101,14 +479,19 @@ int main(void) {
   freeScreenMemory(&screenSetup);
 
   freeCopperlist(copperlist);
-  FreeMem(polygonScratchArea, SCREEN_WIDTH * SCREEN_HEIGHT / 8);
 
-  printf("Hello from C\n");
+  for (y = 0; y < 32; ++y) {
+    for (x = 0; x < SCRATCH_AREA_WIDTH_BYTES; ++x) {
+      printf("%d ", scratchArea[y * SCRATCH_AREA_WIDTH_BYTES + x]);
+    }
 
-  printf("%d %d\n", setup.dx, setup.dy);
-  printf("%d %d %d\n", setup.sud, setup.sul, setup.aul);
+    printf("\n");
+  }
 
-  printf("%d %d\n", setup.accumulator, setup.sign);
+  printf("%d\n", 16 & 15);
+
+  FreeMem(coolbunArea, COOL_BUN_MEMORY_SIZE);
+  FreeMem(scratchArea, SCRATCH_AREA_MEMORY_SIZE);
 
   return 0;
 }
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new file mode 100644
index 0000000..bad98b2
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@@ -0,0 +1,1604 @@
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+         sodipodi:role="line"
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+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583;fill:#ff0000"
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+         x="38.118443"
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
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+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+         sodipodi:role="line"
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+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+         id="tspan62"
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+         x="84.32222"
+         y="76.681122">unneeded area</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:7.6454px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#0000ff;stroke-width:0.264583"
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+         sodipodi:role="line"
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+         x="11.320262"
+         y="18.361753">Wow this is some text cool!</tspan></text>
+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
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+         sodipodi:role="line"
+         id="tspan64"
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+         x="10.989493"
+         y="87.921837">D start</tspan></text>
+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+         id="tspan65"
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+         x="38.118443"
+         y="87.863625">(8 words - 1) = 112 bytes</tspan></text>
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
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+         x="10.989493"
+         y="113.17444">A start</tspan></text>
+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+         x="38.118443"
+         y="113.17444">0 words = 0 bytes</tspan></text>
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+         x="38.118443"
+         y="100.51853">Right = ascending</tspan></text>
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+         id="tspan75"
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
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+         x="84.32222"
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+    <text
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+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
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+         sodipodi:role="line"
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+       style="font-weight:bold;font-size:4.49876px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
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+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="206.45558">right = ascending</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="225.15331"
+       id="text130"><tspan
+         sodipodi:role="line"
+         id="tspan130"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="225.15331">Length</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="38.118443"
+       y="224.98135"
+       id="text131"><tspan
+         sodipodi:role="line"
+         id="tspan131"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="224.98135">8 words</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="231.0899"
+       id="text132"><tspan
+         sodipodi:role="line"
+         id="tspan132"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="231.0899">First word mask</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="44.557232"
+       y="231.13612"
+       id="text133"><tspan
+         sodipodi:role="line"
+         id="tspan133"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="44.557232"
+         y="231.13612">0b1111111100000000</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="236.39546"
+       id="text134"><tspan
+         sodipodi:role="line"
+         id="tspan134"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="236.39546">Last word mask</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="44.557232"
+       y="236.44168"
+       id="text135"><tspan
+         sodipodi:role="line"
+         id="tspan135"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="44.557232"
+         y="236.44168">0b0000111111111111</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="84.32222"
+       y="236.29655"
+       id="text136"><tspan
+         sodipodi:role="line"
+         id="tspan136"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="84.32222"
+         y="236.29655">same as shift distance</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="212.27037"
+       id="text137"><tspan
+         sodipodi:role="line"
+         id="tspan137"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="212.27037">Shift distance</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="40.77216"
+       y="212.53647"
+       id="text138"><tspan
+         sodipodi:role="line"
+         id="tspan138"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="40.77216"
+         y="212.53647">(floor(100 / 16) * 16) - 100 + 8 = 4 bits</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="84.32222"
+       y="230.94385"
+       id="text139"><tspan
+         sodipodi:role="line"
+         id="tspan139"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="84.32222"
+         y="230.94385">unneeded area</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:7.6454px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#0000ff;stroke-width:0.264583"
+       x="11.320262"
+       y="18.361753"
+       id="text140"
+       clip-path="url(#clipPath63)"
+       transform="translate(58.76782,178.68556)"><tspan
+         sodipodi:role="line"
+         id="tspan140"
+         style="fill:#0000ff;stroke-width:0.264583"
+         x="11.320262"
+         y="18.361753">Wow this is some text cool!</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="242.18456"
+       id="text141"><tspan
+         sodipodi:role="line"
+         id="tspan141"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="242.18456">D start</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="38.118443"
+       y="242.12634"
+       id="text142"><tspan
+         sodipodi:role="line"
+         id="tspan142"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="242.12634">(8 words - 1) = 112 bytes</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="267.43716"
+       id="text143"><tspan
+         sodipodi:role="line"
+         id="tspan143"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="267.43716">A start</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="38.118443"
+       y="267.43716"
+       id="text144"><tspan
+         sodipodi:role="line"
+         id="tspan144"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="267.43716">0 words = 0 bytes</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="254.88297"
+       id="text145"><tspan
+         sodipodi:role="line"
+         id="tspan145"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="254.88297">Shift needed</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="38.118443"
+       y="254.78125"
+       id="text146"><tspan
+         sodipodi:role="line"
+         id="tspan146"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="254.78125">Right = ascending</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="273.47897"
+       id="text147"><tspan
+         sodipodi:role="line"
+         id="tspan147"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="273.47897">Length</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="38.118443"
+       y="273.30701"
+       id="text148"><tspan
+         sodipodi:role="line"
+         id="tspan148"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="273.30701">7 words</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="279.41556"
+       id="text149"><tspan
+         sodipodi:role="line"
+         id="tspan149"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="279.41556">First word mask</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="44.557232"
+       y="279.46179"
+       id="text150"><tspan
+         sodipodi:role="line"
+         id="tspan150"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="44.557232"
+         y="279.46179">0b1111111111111111</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="284.72113"
+       id="text151"><tspan
+         sodipodi:role="line"
+         id="tspan151"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="284.72113">Last word mask</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="44.557232"
+       y="284.76736"
+       id="text152"><tspan
+         sodipodi:role="line"
+         id="tspan152"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="44.557232"
+         y="284.76736">0b1111000000000000</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="84.32222"
+       y="284.62222"
+       id="text153"><tspan
+         sodipodi:role="line"
+         id="tspan153"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="84.32222"
+         y="284.62222">same as shift distance</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="260.59604"
+       id="text154"><tspan
+         sodipodi:role="line"
+         id="tspan154"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="260.59604">Shift distance</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="40.77216"
+       y="260.86215"
+       id="text155"><tspan
+         sodipodi:role="line"
+         id="tspan155"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="40.77216"
+         y="260.86215">100 - (floor(100 / 16) * 16) + 8 = 12 bits</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="84.32222"
+       y="279.26953"
+       id="text156"><tspan
+         sodipodi:role="line"
+         id="tspan156"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="84.32222"
+         y="279.26953">unneeded area</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="10.989493"
+       y="290.51022"
+       id="text157"><tspan
+         sodipodi:role="line"
+         id="tspan157"
+         style="stroke-width:0.264583"
+         x="10.989493"
+         y="290.51022">D start</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:3.98704px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="38.118443"
+       y="290.45203"
+       id="text158"><tspan
+         sodipodi:role="line"
+         id="tspan158"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="38.118443"
+         y="290.45203">(8 words - 1) = 112 bytes</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:10.5833px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;stroke-width:0.264583"
+       x="129.83415"
+       y="184.93355"
+       id="text159"><tspan
+         sodipodi:role="line"
+         id="tspan159"
+         style="stroke-width:0.264583"
+         x="129.83415"
+         y="184.93355">tx = 8</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:7.6454px;line-height:1.25;font-family:'Topaz New';-inkscape-font-specification:'Topaz New Bold';letter-spacing:0px;word-spacing:0px;fill:#ff0000;stroke-width:0.264583"
+       x="6.1810875"
+       y="174.69064"
+       id="text160"><tspan
+         sodipodi:role="line"
+         id="tspan160"
+         style="fill:#ff0000;stroke-width:0.264583"
+         x="6.1810875"
+         y="174.69064">Wow this is some text cool!</tspan></text>
+  </g>
+</svg>
diff --git a/old/other_blitter.c b/old/other_blitter.c
new file mode 100644
index 0000000..5153b47
--- /dev/null
+++ b/old/other_blitter.c
@@ -0,0 +1,386 @@
+void BlitFirstPlaneFirstRowToSecondRow(struct ScreenSetup *screenSetup) {
+  unsigned char *source = screenSetup->memoryStart;
+  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 2 / 8);
+
+  custom.bltcon0 = 0x09f0;
+  custom.bltcon1 = 0;
+  custom.bltapt = source;
+  custom.bltdpt = target;
+  custom.bltamod = 0;
+  custom.bltdmod = 0;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltsize = 0x0041;
+}
+
+void BlitShiftFirstPlaneFirstRowToThirdRow(struct ScreenSetup *screenSetup) {
+  unsigned char *source = screenSetup->memoryStart;
+  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 4 / 8);
+
+  custom.bltcon0 = 0x49f0;
+  custom.bltcon1 = 0;
+  custom.bltapt = source;
+  custom.bltdpt = target;
+  custom.bltamod = 0;
+  custom.bltdmod = 0;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltsize = 0x0041;
+}
+
+void BlitWithMaskInBChannel(struct ScreenSetup *screenSetup) {
+  unsigned char *source = screenSetup->memoryStart;
+  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 6 / 8);
+  unsigned char *mask = (screenSetup->memoryStart + 8);
+
+  // a is source
+  // b is mask
+  // d is destination
+
+  // so I want AB
+
+  custom.bltcon0 = 0x0dc0;
+  custom.bltcon1 = 0;
+  custom.bltapt = mask;
+  custom.bltbpt = source;
+  custom.bltdpt = target;
+  custom.bltamod = 0;
+  custom.bltdmod = 0;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltsize = 0x0041;
+}
+
+void BlitWithMaskInBDataInCChannel(struct ScreenSetup *screenSetup) {
+  unsigned char *source = screenSetup->memoryStart;
+  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 8 / 8);
+  unsigned char *mask = (screenSetup->memoryStart + 8);
+  unsigned char *background = (screenSetup->memoryStart + 16);
+
+  // a is source
+  // b is mask
+  // c is background
+  // d is destination
+
+  // so I want AB+`AC
+
+  custom.bltcon0 = 0x0fca;
+  custom.bltcon1 = 0;
+  custom.bltapt = mask;
+  custom.bltbpt = source;
+  custom.bltcpt = background;
+  custom.bltdpt = target;
+  custom.bltamod = 0;
+  custom.bltbmod = 0;
+  custom.bltcmod = SCREEN_WIDTH / 8;
+  custom.bltdmod = SCREEN_WIDTH / 8;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltsize = 0x0041;
+}
+
+void BlitDrawHorizontalLine(struct ScreenSetup *screenSetup) {
+
+  // i want to draw a line from 20,20 to 50,80
+  // i need to get dx and dy
+  // dx is 30, dy is 60
+  // the shift value is 20 mod 15 = 5
+  // a data register gets $8000
+  // b data register gets $ffff
+  // text shift is 0
+  // c and d pointers get the word containing the first pixel, so
+  //   screenSetup->memoryStart + 320 * 20 / 8 + 2
+  // module registers get width of bitplane in bytes
+  // blit height is dx + 1 so 31
+  // blit width = 2
+  // logic is ab+'a, so 6, 7, 2, 3, 1, 0
+
+  char *target = screenSetup->memoryStart + (320 * 20 + 20) / 8;
+  int dx = 10;
+  int dy = 60;
+  int tmp;
+
+  if (dx < dy) {
+    tmp = dx;
+    dx = dy;
+    dy = tmp;
+  }
+
+  custom.bltcon0 = (5 << 12) + (11 << 8) + 0xca;
+  custom.bltcon1 = 1;
+  custom.bltapt = 4 * dy - 2 * dx;
+  custom.bltadat = 0x8000;
+  custom.bltbdat = 0xffff;
+  custom.bltcpt = target;
+  custom.bltdpt = target;
+  custom.bltamod = 4 * (dy - dx);
+  custom.bltbmod = 4 * dy;
+  custom.bltcmod = 320 / 8;
+  custom.bltdmod = 320 / 8;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+  custom.bltsize = 0x02 + (dx + 1 << 7);
+}
+
+
+void blit_buildGenericBlitData(
+  struct BlitAreaDetails *source,
+  struct BlitGenericData *data,
+  uint16_t sx,
+  uint16_t sy,
+  uint16_t ex,
+  uint16_t ey,
+  uint16_t tx,
+  uint16_t ty
+) {
+  int8_t shift = (sx & 0xfff0) - sx + (tx & 15);
+
+  uint8_t needsDescending = shift < 0;
+
+  uint8_t i;
+
+  uint8_t firstWordPixelMask;
+  uint8_t lastWordPixelMask;
+
+  uint16_t firstWordMask = 0xFFFF;
+  uint16_t lastWordMask = 0xFFFF;
+
+  uint16_t wordSource, wordTarget;
+  uint16_t heightStart;
+  uint16_t targetHeightStart;
+
+  // this is correct, there will always be at least two bytes
+  uint16_t width = WORD_ALIGNED_BYTE_X(ex - sx + abs(shift)) + 2;
+
+  uint16_t height = ey;
+
+  //printf("%d %d %d\n", wordStart, wordEnd, width);
+
+  data->shift = shift;
+  data->width = width;
+  data->height = height;
+
+  firstWordMask = 0x0000;
+  lastWordMask = 0x0000;
+
+  if (needsDescending) {
+    wordSource = WORD_ALIGNED_BYTE_X(sx) + width - 2;
+    wordTarget = WORD_ALIGNED_BYTE_X(tx) + width - 2;
+    heightStart = WORD_ALIGNED_BYTE_X(source->drawAreaWidth * ey);
+    targetHeightStart = WORD_ALIGNED_BYTE_X(source->drawAreaWidth * (ty + height));
+
+    // this needs to be more precise
+    // using x positions and not this niave approach
+    firstWordPixelMask = (ex & 15) + 1;
+    lastWordPixelMask = 16 - (sx & 15);
+
+    for (i = 0; i < lastWordPixelMask; ++i) {
+      uint16_t bit = (1 << i);
+
+      lastWordMask += bit;
+    }
+
+    for (i = 0; i < firstWordPixelMask; ++i) {
+      uint16_t bit = (1 << (15 - i));
+
+      firstWordMask += bit;
+    }
+  } else {
+    wordSource = WORD_ALIGNED_BYTE_X(sx);
+    wordTarget = WORD_ALIGNED_BYTE_X(tx);
+    heightStart = WORD_ALIGNED_BYTE_X(0);
+    targetHeightStart = WORD_ALIGNED_BYTE_X(source->drawAreaWidth * ty);
+
+    firstWordPixelMask = 16 - (sx & 15);
+    lastWordPixelMask = (ex & 15) + 1 - shift;
+
+    for (i = 0; i < firstWordPixelMask; ++i) {
+      uint16_t bit = (1 << i);
+
+      firstWordMask += bit;
+    }
+
+    for (i = 0; i < lastWordPixelMask; ++i) {
+      uint16_t bit = (1 << (15 - i));
+
+      lastWordMask += bit;
+    }
+  }
+
+  data->heightStart = heightStart;
+  data->targetHeightStart = targetHeightStart;
+  data->wordSource = wordSource;
+  data->wordTarget = wordTarget;
+  data->firstWordMask = firstWordMask;
+  data->lastWordMask = lastWordMask;
+}
+
+void blit_generic(
+  struct BlitAreaDetails *source,
+  struct BlitGenericData *blitGenericData,
+  uint16_t sx,
+  uint16_t sy,
+  uint16_t ex,
+  uint16_t ey,
+  uint16_t tx,
+  uint16_t ty
+) {
+  uint8_t needsDescending;
+
+  blit_buildGenericBlitData(
+    source,
+    blitGenericData,
+    sx, sy, ex, ey, tx, ty
+  );
+
+  needsDescending = blitGenericData->shift < 0;
+
+  custom.bltcon0 = 0xF0 + (1 << 8) + (1 << 11) + (abs(blitGenericData->shift) << 12);
+  custom.bltcon1 = (needsDescending << 1);
+
+  custom.bltadat = 0xFFFF;
+
+  custom.bltafwm = blitGenericData->firstWordMask;
+  custom.bltalwm = blitGenericData->lastWordMask;
+
+  custom.bltapt = source->target + blitGenericData->heightStart + blitGenericData->wordSource;
+  custom.bltdpt = source->target + blitGenericData->targetHeightStart + blitGenericData->wordTarget;
+
+  custom.bltamod = source->drawAreaWidth / 8 - blitGenericData->width;
+  custom.bltdmod = source->drawAreaWidth / 8 - blitGenericData->width;
+
+  custom.bltsize = (blitGenericData->width / 2) + ((blitGenericData->height + 1) << 6);
+
+  WaitBlit();
+}
+
+void blit_fillAreaDetailsFromScreenSetup(
+  struct ScreenSetup *screenSetup,
+  struct BlitAreaDetails *blitAreaDetails
+) {
+  blitAreaDetails->target = screenSetup->memoryStart;
+  blitAreaDetails->drawAreaWidth = screenSetup->width;
+  blitAreaDetails->nextBitplaneAdvance = screenSetup->nextBitplaneAdvance;
+  blitAreaDetails->contiguousBitplanes = screenSetup->bitplanes;
+}
+
+
+void blit_copyOneToOne(
+  struct BlitAreaDetails *source,
+  struct BlitAreaDetails *target,
+  uint16_t sx,
+  uint16_t sy,
+  uint16_t ex,
+  uint16_t ey,
+  uint16_t tx,
+  uint16_t ty
+) {
+  uint16_t dx = ex - sx;
+  uint16_t dy = ey - sy;
+
+  // 23 = 2
+  // 24 = 3
+  // 0-15 has to equal 2
+  // 16-31 has to equal 4
+  //
+  // 23 = ((23 / 8) & fffe) + 2 = 
+  uint16_t aModulo = (source->drawAreaWidth / 8) - (((dx + 16) >> 3) & 0xfffe);
+  uint16_t dModulo = (target->drawAreaWidth / 8) - (((dx + 16) >> 3) & 0xfffe);
+
+  uint8_t shiftA = sx % 16;
+
+  unsigned char *aPointer = source->target + WORD_ALIGNED_BYTE_POSITION(source->drawAreaWidth, sx, sy);
+  unsigned char *dPointer = target->target + WORD_ALIGNED_BYTE_POSITION(target->drawAreaWidth, tx, ty);
+
+  custom.bltcon0 = (1 << 11) + (1 << 8) + 0xca;
+  custom.bltcon1 = (1 << 1);
+  //custom.bltapt = aPointer;
+  //custom.bltdpt = dPointer;
+
+  custom.bltapt = aPointer + WORD_ALIGNED_BYTE_POSITION(source->drawAreaWidth, dx, dy);
+  custom.bltdpt = dPointer + WORD_ALIGNED_BYTE_POSITION(target->drawAreaWidth, dx, dy);
+
+  custom.bltamod = aModulo;
+  custom.bltdmod = dModulo;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+
+  custom.bltsize = (dx / 16) + 1 + (dy << 6);
+}
+
+void blit_howDoesFWMandLWMWork(
+  struct BlitAreaDetails *source,
+  struct BlitAreaDetails *target
+) {
+  // goal: shift over one pixel to right
+  // width: 32px + 1px shift = 33 = 3 words
+  // fw mask = 0xffff -- copy everything
+  // lw mask = 0x0000 -- do not copy anything
+
+  // enable a, b, and c
+  custom.bltcon0 = 0xF0 + (1 << 8) + (1 << 11) + (1 << 12);
+  custom.bltcon1 = 0;
+
+  custom.bltadat = 0xffff;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0x0000;
+
+  custom.bltapt = source->target;
+  custom.bltdpt = target->target + 40;
+
+  custom.bltamod = source->drawAreaWidth ;
+  custom.bltbmod = target->drawAreaWidth;
+
+  custom.bltsize = (3) + (1 << 6);
+
+  WaitBlit();
+
+  // this will need to go in reverse so i can shift left
+  custom.bltcon0 = 0xF0 + (1 << 8) + (1 << 11) + (1 << 12);
+  custom.bltcon1 = (1 << 1);
+
+  custom.bltadat = 0x0000;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0x0000;
+
+  custom.bltapt = source->target + 10 + 2;
+  custom.bltdpt = target->target + 40 + 10 + 2;
+
+  custom.bltamod = source->drawAreaWidth;
+  custom.bltdmod = target->drawAreaWidth;
+
+  custom.bltsize = (3) + (1 << 6);
+  WaitBlit();
+
+
+}
+
+// TODO: blit_drawRectangle
+void blit_clearScreen(struct ScreenSetup *screenSetup, int color) {
+  unsigned char *target = screenSetup->memoryStart;
+  int i;
+
+  // a is source
+  // b is mask
+  // c is background
+  // d is destination
+
+  // so I want AB+`AC
+
+  custom.bltcon0 = (0x01 << 8) + 0xf0;
+  custom.bltcon1 = 0;
+  custom.bltamod = 0;
+  custom.bltdmod = 0;
+  custom.bltafwm = 0xffff;
+  custom.bltalwm = 0xffff;
+
+  for (i = 0; i < screenSetup->bitplanes; ++i) {
+    custom.bltadat = color & 1 == 1 ? 0xffff : 0;
+    custom.bltdpt = target + (320 * 256 / 8) * i;
+    custom.bltsize = (256 << 7) + (320 / 8);
+    myWaitBlit();
+
+    color >>= 1;
+  }
+}
+
diff --git a/other_blitter.c b/other_blitter.c
deleted file mode 100644
index fe48286..0000000
--- a/other_blitter.c
+++ /dev/null
@@ -1,124 +0,0 @@
-void BlitFirstPlaneFirstRowToSecondRow(struct ScreenSetup *screenSetup) {
-  unsigned char *source = screenSetup->memoryStart;
-  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 2 / 8);
-
-  custom.bltcon0 = 0x09f0;
-  custom.bltcon1 = 0;
-  custom.bltapt = source;
-  custom.bltdpt = target;
-  custom.bltamod = 0;
-  custom.bltdmod = 0;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-  custom.bltsize = 0x0041;
-}
-
-void BlitShiftFirstPlaneFirstRowToThirdRow(struct ScreenSetup *screenSetup) {
-  unsigned char *source = screenSetup->memoryStart;
-  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 4 / 8);
-
-  custom.bltcon0 = 0x49f0;
-  custom.bltcon1 = 0;
-  custom.bltapt = source;
-  custom.bltdpt = target;
-  custom.bltamod = 0;
-  custom.bltdmod = 0;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-  custom.bltsize = 0x0041;
-}
-
-void BlitWithMaskInBChannel(struct ScreenSetup *screenSetup) {
-  unsigned char *source = screenSetup->memoryStart;
-  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 6 / 8);
-  unsigned char *mask = (screenSetup->memoryStart + 8);
-
-  // a is source
-  // b is mask
-  // d is destination
-
-  // so I want AB
-
-  custom.bltcon0 = 0x0dc0;
-  custom.bltcon1 = 0;
-  custom.bltapt = mask;
-  custom.bltbpt = source;
-  custom.bltdpt = target;
-  custom.bltamod = 0;
-  custom.bltdmod = 0;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-  custom.bltsize = 0x0041;
-}
-
-void BlitWithMaskInBDataInCChannel(struct ScreenSetup *screenSetup) {
-  unsigned char *source = screenSetup->memoryStart;
-  unsigned char *target = (screenSetup->memoryStart + SCREEN_WIDTH * 8 / 8);
-  unsigned char *mask = (screenSetup->memoryStart + 8);
-  unsigned char *background = (screenSetup->memoryStart + 16);
-
-  // a is source
-  // b is mask
-  // c is background
-  // d is destination
-
-  // so I want AB+`AC
-
-  custom.bltcon0 = 0x0fca;
-  custom.bltcon1 = 0;
-  custom.bltapt = mask;
-  custom.bltbpt = source;
-  custom.bltcpt = background;
-  custom.bltdpt = target;
-  custom.bltamod = 0;
-  custom.bltbmod = 0;
-  custom.bltcmod = SCREEN_WIDTH / 8;
-  custom.bltdmod = SCREEN_WIDTH / 8;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-  custom.bltsize = 0x0041;
-}
-
-void BlitDrawHorizontalLine(struct ScreenSetup *screenSetup) {
-
-  // i want to draw a line from 20,20 to 50,80
-  // i need to get dx and dy
-  // dx is 30, dy is 60
-  // the shift value is 20 mod 15 = 5
-  // a data register gets $8000
-  // b data register gets $ffff
-  // text shift is 0
-  // c and d pointers get the word containing the first pixel, so
-  //   screenSetup->memoryStart + 320 * 20 / 8 + 2
-  // module registers get width of bitplane in bytes
-  // blit height is dx + 1 so 31
-  // blit width = 2
-  // logic is ab+'a, so 6, 7, 2, 3, 1, 0
-
-  char *target = screenSetup->memoryStart + (320 * 20 + 20) / 8;
-  int dx = 10;
-  int dy = 60;
-  int tmp;
-
-  if (dx < dy) {
-    tmp = dx;
-    dx = dy;
-    dy = tmp;
-  }
-
-  custom.bltcon0 = (5 << 12) + (11 << 8) + 0xca;
-  custom.bltcon1 = 1;
-  custom.bltapt = 4 * dy - 2 * dx;
-  custom.bltadat = 0x8000;
-  custom.bltbdat = 0xffff;
-  custom.bltcpt = target;
-  custom.bltdpt = target;
-  custom.bltamod = 4 * (dy - dx);
-  custom.bltbmod = 4 * dy;
-  custom.bltcmod = 320 / 8;
-  custom.bltdmod = 320 / 8;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-  custom.bltsize = 0x02 + (dx + 1 << 7);
-}
-
diff --git a/smakefile b/smakefile
index 0cbc79e..cb94cdf 100644
--- a/smakefile
+++ b/smakefile
@@ -6,5 +6,12 @@ all: main
 .s.o:
 	genam -l $*.s
 
-main: main.o system.o blitter.o screen.o copper.o
-	sc link to main main.o system.o blitter.o screen.o copper.o
+system.lib: system/system.o system/copper.o system/blitter.o
+	sc objectlibrary=system.lib system/system.o system/copper.o system/blitter.o
+
+main: main.o images.o system.lib screen.o
+	sc link to main main.o system.lib screen.o images.o
+
+test: blitter_test.o blitter.o system.o
+	sc link to blitter_test identifierlength=32 math=standard blitter_test.o blitter.o cutest/CuTest.c system.o
+
diff --git a/blitter.c b/system/blitter.c
similarity index 54%
rename from blitter.c
rename to system/blitter.c
index c6d5cac..8a5d4a6 100644
--- a/blitter.c
+++ b/system/blitter.c
@@ -3,7 +3,7 @@
 
 #include "blitter.h"
 #include "system.h"
-#include "types.h"
+#include "../types.h"
 
 extern struct Custom far custom;
 
@@ -63,16 +63,6 @@ void blit_drawSingleLine(
     custom.bltsize = 0x02 + ((setup->dx + 1) << 6);
 }
 
-void blit_fillAreaDetailsFromScreenSetup(
-  struct ScreenSetup *screenSetup,
-  struct BlitAreaDetails *blitAreaDetails
-) {
-  blitAreaDetails->target = screenSetup->memoryStart;
-  blitAreaDetails->drawAreaWidth = screenSetup->width;
-  blitAreaDetails->nextBitplaneAdvance = screenSetup->nextBitplaneAdvance;
-  blitAreaDetails->contiguousBitplanes = screenSetup->bitplanes;
-}
-
 void blit_drawLine(
   struct BlitAreaDetails *blitAreaDetails,
   struct BlitDrawLineSetup *setup,
@@ -99,99 +89,6 @@ void blit_drawLine(
   }
 }
 
-void blit_copyOneToOne(
-  struct BlitAreaDetails *source,
-  struct BlitAreaDetails *target,
-  uint16_t sx,
-  uint16_t sy,
-  uint16_t ex,
-  uint16_t ey,
-  uint16_t tx,
-  uint16_t ty
-) {
-  uint16_t dx = ex - sx;
-  uint16_t dy = ey - sy;
-
-  // 23 = 2
-  // 24 = 3
-  // 0-15 has to equal 2
-  // 16-31 has to equal 4
-  //
-  // 23 = ((23 / 8) & fffe) + 2 = 
-  uint16_t aModulo = (source->drawAreaWidth / 8) - (((dx + 16) >> 3) & 0xfffe);
-  uint16_t dModulo = (target->drawAreaWidth / 8) - (((dx + 16) >> 3) & 0xfffe);
-
-  uint8_t shiftA = sx % 16;
-
-  unsigned char *aPointer = source->target + WORD_ALIGNED_BYTE_POSITION(source->drawAreaWidth, sx, sy);
-  unsigned char *dPointer = target->target + WORD_ALIGNED_BYTE_POSITION(target->drawAreaWidth, tx, ty);
-
-  custom.bltcon0 = (1 << 11) + (1 << 8) + 0xca;
-  custom.bltcon1 = (1 << 1);
-  //custom.bltapt = aPointer;
-  //custom.bltdpt = dPointer;
-
-  custom.bltapt = aPointer + WORD_ALIGNED_BYTE_POSITION(source->drawAreaWidth, dx, dy);
-  custom.bltdpt = dPointer + WORD_ALIGNED_BYTE_POSITION(target->drawAreaWidth, dx, dy);
-
-  custom.bltamod = aModulo;
-  custom.bltdmod = dModulo;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-
-  custom.bltsize = (dx / 16) + 1 + (dy << 6);
-}
-
-void blit_howDoesFWMandLWMWork(
-  struct BlitAreaDetails *target
-) {
-  // data in a
-  // setting fwm and lwm to mask that
-
-  // dma enabled for only D
-  custom.bltcon0 = 0xF0 + (1 << 8);
-  custom.bltcon1 = 0;
-
-  custom.bltadat = 0xffff;
-  custom.bltafwm = 0x0ff0;
-  custom.bltalwm = 0xf0f0;
-
-  custom.bltdpt = target->target;
-  custom.bltamod = 0;
-  custom.bltbmod = 0;
-
-  custom.bltsize = (2) + (1 << 6);
-}
-
-// TODO: blit_drawRectangle
-void blit_clearScreen(struct ScreenSetup *screenSetup, int color) {
-  unsigned char *target = screenSetup->memoryStart;
-  int i;
-
-  // a is source
-  // b is mask
-  // c is background
-  // d is destination
-
-  // so I want AB+`AC
-
-  custom.bltcon0 = (0x01 << 8) + 0xf0;
-  custom.bltcon1 = 0;
-  custom.bltamod = 0;
-  custom.bltdmod = 0;
-  custom.bltafwm = 0xffff;
-  custom.bltalwm = 0xffff;
-
-  for (i = 0; i < screenSetup->bitplanes; ++i) {
-    custom.bltadat = color & 1 == 1 ? 0xffff : 0;
-    custom.bltdpt = target + (320 * 256 / 8) * i;
-    custom.bltsize = (256 << 7) + (320 / 8);
-    myWaitBlit();
-
-    color >>= 1;
-  }
-}
-
 void blit_fillPolygon(
   struct ScreenSetup *screenSetup,
   uint16_t sx,
diff --git a/blitter.h b/system/blitter.h
similarity index 71%
rename from blitter.h
rename to system/blitter.h
index 68da825..48a4b4e 100644
--- a/blitter.h
+++ b/system/blitter.h
@@ -5,6 +5,7 @@
 #include "screen.h"
 
 #define WORD_ALIGNED_BYTE_POSITION(width, x, y) (((width * y + x) >> 3) & 0xfffe)
+#define WORD_ALIGNED_BYTE_X(x) (((x) >> 3) & 0xfffe)
 
 struct BlitAreaDetails {
   unsigned char *target;
@@ -56,7 +57,25 @@ void blit_copyOneToOne(
 );
 
 void blit_howDoesFWMandLWMWork(
+  struct BlitAreaDetails *source,
   struct BlitAreaDetails *target
 );
 
+struct BlitGenericData {
+  int8_t shift, leftShift;
+  uint16_t width, height;
+  uint16_t heightStart, targetHeightStart;
+  uint16_t wordSource, wordTarget;
+  uint16_t firstWordMask, lastWordMask;
+};
+
+void blit_marquee(
+  struct BlitAreaDetails *source,
+  struct BlitGenericData *data,
+  uint16_t splitPoint,
+  uint16_t ex,
+  uint16_t ey,
+  uint16_t ty
+);
+
 #endif
diff --git a/copper.c b/system/copper.c
similarity index 100%
rename from copper.c
rename to system/copper.c
diff --git a/copper.h b/system/copper.h
similarity index 90%
rename from copper.h
rename to system/copper.h
index 8285d2e..0ce5e3c 100644
--- a/copper.h
+++ b/system/copper.h
@@ -3,7 +3,7 @@
 
 #define COPPERLIST_SIZE (10000)
 
-#include "types.h"
+#include "../types.h"
 
 uint16_t * prepareNewCopperlist(void);
 void setCopperlist(uint16_t *copperlist);
diff --git a/system/smakefile b/system/smakefile
new file mode 100644
index 0000000..9bdee46
--- /dev/null
+++ b/system/smakefile
@@ -0,0 +1,8 @@
+.s.o:
+	genam -l $*.s
+
+.c.o:
+	sc $@ $*.c
+
+system.lib: system.o
+	sv objectlibrary=system.library system.o
diff --git a/system.h b/system/system.h
similarity index 100%
rename from system.h
rename to system/system.h
diff --git a/system.s b/system/system.s
similarity index 100%
rename from system.s
rename to system/system.s