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Atari 2600 - fix mapper E7 for games that used ram (Burger Time, He-Man)

This commit is contained in:
adelikat 2014-04-11 22:00:16 +00:00
parent dd651b2ca8
commit a329ef846d
1 changed files with 11 additions and 10 deletions
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21
BizHawk.Emulation.Cores/Consoles/Atari/2600/Mappers/mE7.cs
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@ -34,8 +34,6 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private int _rambank1Toggle;
private ByteBuffer _ram = new ByteBuffer(2048);
//private ByteBuffer _rambank0 = new ByteBuffer(1024);
//private ByteBuffer _rambank1 = new ByteBuffer(1024);
private bool _enableRam0;
public override void SyncState(Serializer ser)
@ -99,14 +97,15 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
return Core.Rom[(_rombank1K * 0x800) + (addr & 0x7FF)];
}
if (addr < 0x1900) // Ram 1 Read port
{
return _ram[(RamBank1Offset + _rambank1Toggle * 0x100) + (addr & 0xFF)];
}
if (addr < 0x1A00) // Ram 1 Write port
if (addr < 0x1900) // Ram 1 Write port
{
return _ram[RamBank1Offset + (_rambank1Toggle * 0x100) + (addr & 0xFF)] = 0xFF; // Reading from the 256b write port @1800 riggers an unwanted write
}
if (addr < 0x1A00) // Ram 1 Read port
{
return _ram[(RamBank1Offset + _rambank1Toggle * 0x100) + (addr & 0xFF)];
}
if (addr < 0x2000)
@ -137,11 +136,11 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
base.WriteMemory(addr, value);
}
else if (addr < 0x1400)
else if (addr < 0x1400 && _enableRam0)
{
_ram[addr & 0x3FF] = value;
}
else if (addr >= 0x1800 && addr < 0x2000)
else if (addr >= 0x1800 && addr < 0x1900)
{
_ram[RamBank1Offset + (addr & 0xFF) + (_rambank1Toggle * 0x100)] = value;
}
@ -149,6 +148,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private void Address(ushort addr)
{
_enableRam0 = false;
switch (addr)
{
case 0x1FE0:
@ -173,6 +173,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
_rombank1K = 6;
break;
case 0x1FE7:
_rombank1K = 7;
_enableRam0 = true;
break;
case 0x1FE8: