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Atari 2600 - implement mapper FE

This commit is contained in:
adelikat 2014-04-12 03:48:18 +00:00
parent 50c8e05d65
commit a1cb4b151e
3 changed files with 11 additions and 5 deletions
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2
BizHawk.Emulation.Cores/Consoles/Atari/2600/Atari2600.Core.cs
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@ -68,8 +68,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
public byte ReadMemory(ushort addr) public byte ReadMemory(ushort addr)
{ {
_mapper.Bit13 = addr.Bit(13);
var temp = _mapper.ReadMemory((ushort)(addr & 0x1FFF)); var temp = _mapper.ReadMemory((ushort)(addr & 0x1FFF));
CoreComm.MemoryCallbackSystem.CallRead(addr); CoreComm.MemoryCallbackSystem.CallRead(addr);
return temp; return temp;

2
BizHawk.Emulation.Cores/Consoles/Atari/2600/Mappers/MapperBase.cs
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@ -39,5 +39,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
public virtual void HardReset() { } public virtual void HardReset() { }
// THis is here purely for mapper 3E because it needs the 13th bit to determine bankswitching (but only receives the first 12 on read memory)
public bool Bit13 { get; set; }
} }
} }

12
BizHawk.Emulation.Cores/Consoles/Atari/2600/Mappers/mFE.cs
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@ -1,4 +1,4 @@
using System; using BizHawk.Common;
namespace BizHawk.Emulation.Cores.Atari.Atari2600 namespace BizHawk.Emulation.Cores.Atari.Atari2600
{ {
@ -56,12 +56,16 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
Using emulators or similar there is a large cheat that can be used. A13 can be used Using emulators or similar there is a large cheat that can be used. A13 can be used
to simply select which 8K bank to be in. to simply select which 8K bank to be in.
*/ */
internal class mFE : MapperBase internal class mFE : MapperBase
{ {
public mFE() public override byte ReadMemory(ushort addr)
{ {
throw new NotImplementedException(); if (addr < 0x1000)
{
return base.ReadMemory(addr);
}
return Core.Rom[(addr & 0x0FFF) + (Bit13 ? 0 : 4096)];
} }
} }
} }