diff --git a/bun.c b/bun.c
index 9d69eb7..5fa8ace 100644
--- a/bun.c
+++ b/bun.c
@@ -94,7 +94,7 @@ void bun_offRightSide(
     bltalwm += (1 << (15 - i));
   }
 
-  bltcon0 = BLTCON0(0xc0, 0, 1, 0, 1, shift);
+  bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
   bltcon1 = BLTCON1(bunClear->direction, shift);
 
   bltdmod = screenSetup->byteWidth - COOL_BUN_WIDTH_BYTES +
@@ -106,15 +106,14 @@ void bun_offRightSide(
     custom.bltcon0 = bltcon0;
     custom.bltcon1 = bltcon1;
 
-    custom.bltadat = 0xffff;
-    custom.bltbpt = coolbunPlaneStarts[BUN_OFF_LEFT_SIDE][plane];
+    custom.bltapt = coolbunPlaneStarts[BUN_OFF_LEFT_SIDE][plane];
     custom.bltdpt = currentScreen->planes[plane] +
       bunClear->memoryStartOffsetBytes;
 
     custom.bltafwm = 0xffff;
     custom.bltalwm = bltalwm;
 
-    custom.bltbmod = wordShift * 2;
+    custom.bltamod = wordShift * 2;
     custom.bltdmod = bltdmod;
 
     custom.bltsize = bltsize;
@@ -150,7 +149,7 @@ void bun_offLeftSide(
     bltalwm += (1 << i);
   }
 
-  bltcon0 = BLTCON0(0xc0, 0, 1, 0, 1, shift);
+  bltcon0 = BLTCON0(0xf0, 1, 0, 0, 1, shift);
   bltcon1 = BLTCON1(bunClear->direction, shift);
   bltdmod = screenSetup->byteWidth - 4 + wordShift * 2;
 
@@ -161,10 +160,8 @@ void bun_offLeftSide(
     custom.bltcon0 = bltcon0;
     custom.bltcon1 = bltcon1;
 
-    // a has a mask we're shifting
-    custom.bltadat = 0xffff;
-    // b has bun data
-    custom.bltbpt = coolbunPlaneStarts[BUN_OFF_RIGHT_SIDE][plane];
+    // a has bun data
+    custom.bltapt = coolbunPlaneStarts[BUN_OFF_RIGHT_SIDE][plane];
 
     // d is the part on screen
     custom.bltdpt = currentScreen->planes[plane] + bunClear->memoryStartOffsetBytes;
@@ -172,7 +169,7 @@ void bun_offLeftSide(
     custom.bltafwm = 0xffff;
     custom.bltalwm = bltalwm;
 
-    custom.bltbmod = wordShift * 2;
+    custom.bltamod = wordShift * 2;
     custom.bltdmod = bltdmod;
 
     custom.bltsize = bltsize;
@@ -221,7 +218,6 @@ void bun_anywhere(
     custom.bltdpt = currentScreen->planes[plane] +
       bunClear->memoryStartOffsetBytes;
 
-   // custom.bltdpt = screenSetup.memoryStart;
     custom.bltafwm = 0xffff;
     custom.bltalwm = bltalwm;
 
diff --git a/main b/main
index 660f09c..7f0ca0d 100755
Binary files a/main and b/main differ
diff --git a/main.c b/main.c
index 5be08e9..721dcf7 100644
--- a/main.c
+++ b/main.c
@@ -52,7 +52,7 @@ extern uint8_t chip TopazBitplanes[];
 extern uint16_t chip CopperColors[];
 extern uint16_t chip SpriteCopperlist[];
 extern uint16_t chip SpriteData[];
-extern uint16_t chip MaskBitplane[];
+extern uint8_t chip MaskBitplane[];
 
 #define TOPAZ_WIDTH_PIXELS (160)
 #define TOPAZ_WIDTH_BYTES (TOPAZ_WIDTH_PIXELS / 8)