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[NES] decided how to implement EXP bus infrastructure, even though nothing uses it yet

This commit is contained in:
zeromus 2011-03-13 02:58:29 +00:00
parent ae61bf3926
commit 1d39da2427
2 changed files with 6 additions and 2 deletions
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4
BizHawk.Emulation/Consoles/Nintendo/NES/BoardSystem.cs
View File

@ -16,9 +16,11 @@ namespace BizHawk.Emulation.Consoles.Nintendo
byte ReadPRG(int addr);
byte ReadPPU(int addr); byte PeekPPU(int addr);
byte ReadPRAM(int addr);
byte ReadEXP(int addr);
void WritePRG(int addr, byte value);
void WritePPU(int addr, byte value);
void WritePRAM(int addr, byte value);
void WriteEXP(int addr, byte value);
byte[] SaveRam { get; }
byte[] WRAM { get; set; }
byte[] VRAM { get; set; }
@ -109,6 +111,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public virtual void WritePRAM(int addr, byte value) { }
public virtual byte ReadPRAM(int addr) { return 0xFF; }
public virtual void WriteEXP(int addr, byte value) { }
public virtual byte ReadEXP(int addr) { return 0xFF; }
public virtual void WritePPU(int addr, byte value)
{

4
BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
View File

@ -202,7 +202,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
else if (addr < 0x2000) return ram[addr - 0x1800];
else if (addr < 0x4000) return ReadPPUReg(addr & 7);
else if (addr < 0x4020) return ReadReg(addr); //we're not rebasing the register just to keep register names canonical
else if (addr < 0x6000) return 0xFF; //exp rom
else if (addr < 0x6000) return board.ReadEXP(addr);
else if (addr < 0x8000) return board.ReadPRAM(addr);
else return board.ReadPRG(addr - 0x8000);
}
@ -215,7 +215,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
else if (addr < 0x2000) ram[addr - 0x1800] = value;
else if (addr < 0x4000) WritePPUReg(addr & 7, value);
else if (addr < 0x4020) WriteReg(addr, value); //we're not rebasing the register just to keep register names canonical
else if (addr < 0x6000) { } //exp rom
else if (addr < 0x6000) board.WriteEXP(addr, value);
else if (addr < 0x8000) board.WritePRAM(addr, value);
else board.WritePRG(addr - 0x8000, value);
}