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c64- implement extra color text mode

This commit is contained in:
saxxonpike 2012-11-06 18:36:37 +00:00
parent 7d68c5b518
commit 4c371d9cbe
1 changed files with 10 additions and 2 deletions
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12
BizHawk.Emulation/Computers/Commodore64/VicII.cs
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@ -570,7 +570,10 @@ namespace BizHawk.Emulation.Computers.Commodore64
private void GetBitmapData()
{
ushort offset = (ushort)((regs.CB << 11) + (characterMemory[characterIndex] * 8) + characterRow);
int cMemIndex = characterMemory[characterIndex];
if (regs.ECM)
cMemIndex &= 0x3F;
ushort offset = (ushort)((regs.CB << 11) + (cMemIndex * 8) + characterRow);
bitmapData = mem.VicRead(offset);
}
@ -861,7 +864,12 @@ namespace BizHawk.Emulation.Computers.Commodore64
// extra color text mode
private int Plot100(int offset)
{
return regs.BxC[0];
byte charData = bitmapData;
charData <<= offset;
if ((charData & 0x80) != 0x00)
return colorMemory[characterIndex];
else
return characterMemory[characterIndex] >> 6;
}
// invalid mode