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SMS: Fix Ernie Els Golf GG (has on-cart volatile ram)

This commit is contained in:
beirich 2014-03-18 02:23:10 +00:00
parent 3b66e61c82
commit c825720d33
3 changed files with 64 additions and 5 deletions
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65
BizHawk.Emulation.Cores/Consoles/Sega/SMS/MemoryMap.CodeMasters.cs
View File

@ -2,18 +2,20 @@
{
public partial class SMS
{
// =======================================================================
// The CodeMasters mapper has 3 banks of 16kb, like the Sega mapper.
// The differences are that the paging control addresses are different, and the first 1K of ROM is not protected.
// Bank 0: Control Address $0000 - Maps $0000 - $3FFF
// Bank 1: Control Address $4000 - Maps $4000 - $7FFF
// Bank 2: Control Address $8000 - Maps $8000 - $BFFF
// System RAM is at $C000+ as in the Sega mapper.
// =======================================================================
byte ReadMemoryCM(ushort address)
{
if (address < BankSize * 1) return RomData[(RomBank0 * BankSize) + address];
if (address < BankSize * 2) return RomData[(RomBank1 * BankSize) + (address & BankSizeMask)];
if (address < BankSize * 3) return RomData[(RomBank2 * BankSize) + (address & BankSizeMask)];
if (address < 0x4000) return RomData[(RomBank0 * BankSize) + address];
if (address < 0x8000) return RomData[(RomBank1 * BankSize) + (address & BankSizeMask)];
if (address < 0xC000) return RomData[(RomBank2 * BankSize) + (address & BankSizeMask)];
return SystemRam[address & RamSizeMask];
}
@ -34,7 +36,62 @@
Cpu.WriteMemory = WriteMemoryCM;
WriteMemoryCM(0x0000, 0);
WriteMemoryCM(0x4000, 1);
WriteMemoryCM(0x8000, 2);
WriteMemoryCM(0x8000, 0);
}
// =======================================================================
// CodeMasters with on-board volatile RAM
// =======================================================================
byte ReadMemoryCMRam(ushort address)
{
if (address < 0x4000)
return RomData[(RomBank0 * BankSize) + address];
if (address < 0x8000)
{
if (address >= 0x6000 && RomBank3 == 1)
return ExtRam[address & 0x1FFF];
return RomData[(RomBank1 * BankSize) + (address & BankSizeMask)];
}
if (address < 0xC000)
{
if (address >= 0xA000 && RomBank3 == 1)
return ExtRam[address & 0x1FFF];
return RomData[(RomBank2 * BankSize) + (address & BankSizeMask)];
}
return SystemRam[address & RamSizeMask];
}
void WriteMemoryCMRam(ushort address, byte value)
{
if (address >= 0xC000)
SystemRam[address & RamSizeMask] = value;
else if (address == 0x0000)
RomBank0 = (byte)(value & 0xF);
else if (address == 0x4000)
{
RomBank1 = (byte)(value & 0xF);
RomBank3 = (byte)(((value & 0x80) != 0) ? 1 : 0);
}
else if (address == 0x8000)
RomBank2 = (byte)(value & 0xF);
else if (address >= 0x6000 && address < 0x8000 && RomBank3 == 1)
ExtRam[address & 0x1FFF] = value;
else if (address >= 0xA000 && address < 0xC000 && RomBank3 == 1)
ExtRam[address & 0x1FFF] = value;
}
void InitCodeMastersMapperRam()
{
Cpu.ReadMemory = ReadMemoryCMRam;
Cpu.WriteMemory = WriteMemoryCMRam;
WriteMemoryCM(0x0000, 0);
WriteMemoryCM(0x4000, 1);
WriteMemoryCM(0x8000, 0);
ExtRam = new byte[8192];
RomBank3 = 0;
}
}
}

2
BizHawk.Emulation.Cores/Consoles/Sega/SMS/SMS.cs
View File

@ -145,6 +145,8 @@ namespace BizHawk.Emulation.Cores.Sega.MasterSystem
if (game["CMMapper"])
InitCodeMastersMapper();
else if (game["CMMapperWithRam"])
InitCodeMastersMapperRam();
else if (game["ExtRam"])
InitExt2kMapper(int.Parse(game.OptionValue("ExtRam")));
else if (game["KoreaMapper"])

2
output/gamedb/gamedb_sega_gg.txt
View File

@ -111,7 +111,7 @@ E35A0B3D9A4A3BB6B2E72FAB5A8C1712 Earthworm Jim (E) GG Europe
E4E654AA1730565220120844DAD6B444 Ecco the Dolphin II (J) GG Japan
CCD970B22303887734FAFB8E45B1E43F Ecco the Dolphin (UE) GG USA;Europe
A506FC04C7A0DFAF37423FF0A38AEB2E Ecco the Dolphin (J) GG Japan
E97C20B86EA73248CC7AED602D46C3A4 Ernie Els Golf (E) (En,Fr,De,Es,It) GG Sports;Golf CMMapper;SRAM=8192 Europe
E97C20B86EA73248CC7AED602D46C3A4 Ernie Els Golf (E) (En,Fr,De,Es,It) GG Sports;Golf CMMapperWithRam Europe
C58D6291DA8A4919328B8F42BE8640A7 Eternal Legend - Eien no Densetsu (J) GG Japan
4E63ABB36BE8D86B94B34846B16D9FA3 Evander Holyfield's 'Real Deal' Boxing (UE) GG USA;Europe
309ABE6822C52DF971856912C77A57CC F1 - World Championship Edition (E) GG Europe