104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include <stdio.h>
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#include <i86.h>
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#include <conio.h>
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#include <dos.h>
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extern void __cdecl enableUnchainedVGAMode();
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extern void __cdecl enableTextMode();
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extern void __cdecl fillScreen(int);
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extern void __cdecl latchCopyCube(
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char offset,
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int writtenValue,
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int writeMode,
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int setResetRegister,
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int enableSetResetRegister
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);
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extern void __cdecl writeCube(
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char offset,
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int writeMode,
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int setResetRegister,
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int enableSetResetRegister
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);
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extern void __cdecl drawColorCube(
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char offset,
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int color
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);
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extern int __cdecl paramTest(int wow);
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extern void far interrupt keyboardHandler();
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extern char keyboardPressed;
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extern char lastScancode;
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char far *VGA = (char*)0xA0000;
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#define PLANE_WIDTH (320 / 4)
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void far (interrupt *int9Save)();
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void populateExampleCube(void) {
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int y, x;
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outp(0x3c4, 0x02);
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for (y = 0; y < 16; ++y) {
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for (x = 0; x < 16; ++x) {
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outp(0x3c5, 1 << (x % 4));
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VGA[y * PLANE_WIDTH + x / 4] = y * 16 + x;
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}
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}
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}
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int main(void) {
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// activate unchained vga mode
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// set up 8 very clear colors
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// place some data into video memory to be latch copied
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// show off the following
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// * latch copies
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// * masking
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// * barrel shifting
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int i,j;
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int9Save = _dos_getvect(9);
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_dos_setvect(9, keyboardHandler);
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enableUnchainedVGAMode();
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outp(0x3c8, 255);
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outp(0x3c9, 63);
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outp(0x3c9, 63);
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outp(0x3c9, 63);
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fillScreen(0);
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/*
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populateExampleCube();
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latchCopyCube(8, 0, 0x00, 0, 0);
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latchCopyCube(12, 127, 0x00, 0, 0);
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latchCopyCube(16, 0, 0x08, 0, 0);
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latchCopyCube(20, 127, 0x08, 0, 0);
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latchCopyCube(24, 0, 0x10, 0, 0);
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latchCopyCube(28, 127, 0x10, 0, 0);
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latchCopyCube(32, 0, 0x18, 0, 0);
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latchCopyCube(36, 127, 0x18, 0, 0);
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latchCopyCube(40, 0, 0x18 + 0x04, 0, 0);
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latchCopyCube(44, 127, 0x18 + 0x04, 0, 0);
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latchCopyCube(64, 0, 0x10, 7, 7);
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latchCopyCube(68, 0, 0x10, 7, 0);
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latchCopyCube(72, 0, 0x10, 0, 7);
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*/
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writeCube(0, 0x10, 0, 0);
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writeCube(4, 0x10, 7, 0);
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writeCube(8, 0x10, 7, 7);
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writeCube(12, 0x10, 0, 7);
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while (keyboardPressed == 0);
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_dos_setvect(9, int9Save);
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enableTextMode();
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return 0;
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}
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