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BizHawk
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Fixes compumate mapper 

Still WIP
Needs keyboard peripheral for further testing, but boots for now
This commit is contained in:
alyosha-tas 2016-05-31 09:15:59 -04:00
parent f6b74a97e6
commit 0e34e5f728
1 changed files with 92 additions and 19 deletions
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111
BizHawk.Emulation.Cores/Consoles/Atari/2600/Mappers/mCM.cs
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@ -1,5 +1,6 @@
using BizHawk.Common;
using BizHawk.Common.NumberExtensions;
using System;
namespace BizHawk.Emulation.Cores.Atari.Atari2600
{
@ -183,6 +184,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
private bool _disableRam = true;
private bool _writeMode = false;
private int _column = 0;
public bool _func_key = false;
public bool _shift_key = false;
public override void Dispose()
{
@ -197,8 +200,12 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
_disableRam = true;
_writeMode = true;
_column = 0;
_func_key = false;
_shift_key = false;
base.HardReset();
}
public override void SyncState(Serializer ser)
@ -209,16 +216,62 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
ser.Sync("column", ref _column);
ser.Sync("disableRam", ref _disableRam);
ser.Sync("writeMode", ref _writeMode);
ser.Sync("FuncKey", ref _func_key);
ser.Sync("ShiftKey", ref _shift_key);
base.SyncState(ser);
base.SyncState(ser);
}
public override byte ReadMemory(ushort addr)
private byte ReadMem(ushort addr, bool peek)
{
if (addr < 0x1000)
// A unique feature of the keyboard is that it changes the operation of inputs 0-3
// by holding them high in the no-button-pressed state.
// However exposing this behaviour to the rest of the system would be overly cunmbersome
// so instead we bypass these cases here
if ((addr & 0x000F) == 8 && (addr & 0x1080)==0 && addr<1000)
{
// if func key pressed
if (_func_key == true)
{
return 0x80;
}
else
{
return 0;
}
}
else if ((addr & 0x000F) == 9 && (addr & 0x1080) == 0 && addr < 1000)
{
return 0x80;
}
else if ((addr & 0x000F) == 0xA && (addr & 0x1080) == 0 && addr < 1000)
{
return 0x80;
}
else if ((addr & 0x000F) == 0xB && (addr & 0x1080) == 0 && addr < 1000)
{
// if shift key pressed
if (_shift_key == true)
{
return 0x80;
}
else
{
return 0;
}
}
else if (addr < 0x1000)
{
return base.ReadMemory(addr);
}
return base.ReadMemory(addr);
}
// Lower 2K is always the first 2K of the ROM bank
// Upper 2K is also Rom if ram is enabled
@ -233,16 +286,24 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
return _ram[addr & 0x7FF];
}
// Attempting to read while in write mode
throw new NotTestedException();
// Attempting to read while in write mode
//throw new NotTestedException();
return 0;
}
public override byte PeekMemory(ushort addr)
public override byte ReadMemory(ushort addr)
{
return ReadMem(addr, false);
}
public override byte PeekMemory(ushort addr)
{
return ReadMemory(addr);
return ReadMem(addr,true);
}
public override void WriteMemory(ushort addr, byte value)
private void WriteMem(ushort addr, byte value, bool poke)
{
//Mimicking the 6532 logic for accesing port A, for testing
var isPortA = false;
@ -267,7 +328,7 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
if (registerAddr == 0x00)
{
if (addr != 640)
if (addr != 640 && addr>=0x280) // register addresses are only above 0x280
{
// Write Output reg A
isPortA = true;
@ -277,8 +338,8 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
}
//if (addr == 0x280) //Stella uses only 280
if (isPortA)
if (addr == 0x280 && !poke) //Stella uses only 280
//if (isPortA && !poke)
{
var bit5 = value.Bit(5);
var bit4 = value.Bit(4);
@ -292,9 +353,9 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
_bank4K = value & 0x03;
//D6 = 1 -> increase key column (0 to 9)
//D5 = 1 -> reset key column to 0 (if D4 = 0)
if (bit5 && !bit4)
//D6 = 1 -> increase key column (0 to 9)
//D5 = 1 -> reset key column to 0 (if D4 = 0)
if (bit5 && !bit4)
{
_column = 0;
}
@ -312,8 +373,20 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
_ram[addr & 0x7FF] = value;
}
}
base.WriteMemory(addr, value);
if (addr<0x1000) {
base.WriteMemory(addr, value);
}
}
}
public override void WriteMemory(ushort addr, byte value)
{
WriteMem(addr, value, false);
}
public override void PokeMemory(ushort addr, byte value)
{
WriteMem(addr, value, true);
}
}
}