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commodore64- fix VIC character memory addressing

This commit is contained in:
saxxonpike 2012-11-06 18:13:48 +00:00
parent d1613d2cb5
commit 7d68c5b518
1 changed files with 18 additions and 4 deletions
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22
BizHawk.Emulation/Computers/Commodore64/MemBus.cs
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@ -60,7 +60,6 @@ namespace BizHawk.Emulation.Computers.Commodore64
public byte cia2B;
public byte[] colorRam;
public byte[] ram;
public ushort vicOffset;
// registers
public byte busData;
@ -440,15 +439,30 @@ namespace BizHawk.Emulation.Computers.Commodore64
public byte VicRead(ushort addr)
{
addr = (ushort)(addr & 0x1FFF);
addr = (ushort)(addr & 0x3FFF);
if (addr >= 0x1000 && addr < 0x2000)
{
return charRom[addr & 0x0FFF];
}
else
{
int baseAddr = (3 - (cia1PortA.Data & 0x03)) << 14;
return ram[addr | baseAddr];
int baseAddr = 0;
switch (cia1PortA.Data & 0x03)
{
case 0:
baseAddr = 0xC000 | addr;
break;
case 1:
baseAddr = 0x8000 | addr;
break;
case 2:
baseAddr = 0x4000 | addr;
break;
default:
baseAddr = addr;
break;
}
return ram[(ushort)baseAddr];
}
}