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sum of videoROM modules 256 = 0 in VGA mode. Fixes a few koei games.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2212
This commit is contained in:
Peter Veenstra 2005-05-26 15:25:29 +00:00
parent d23d71add8
commit 719d57bea9
1 changed files with 9 additions and 0 deletions
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9
src/ints/int10_memory.cpp
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@ -108,6 +108,15 @@ void INT10_SetupRomMemory(void) {
phys_writeb(PhysMake(0xf000,0xfa6e)+i,int10_font_08[i]);
}
RealSetVec(0x1F,int10.rom.font_8_second);
if (machine == MCH_VGA) { //EGA/VGA. Just to be safe
/* Sum of all bytes in rom module 256 should be 0 */
Bit8u sum = 0;
for (i = 0;i < 32 * 1024;i++) //32 KB romsize
sum += phys_readb(rom_base + i); //OVERFLOW IS OKAY
sum = 256 - sum;
phys_writeb(rom_base+int10.rom.used++,sum);
}
};