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NES - add WRAM, System Bus, PPU Bus, and Battery RAM as memory domains

This commit is contained in:
andres.delikat 2011-03-06 02:36:49 +00:00
parent 733fb228b6
commit 2354ac126a
2 changed files with 23 additions and 11 deletions
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30
BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs
View File

@ -447,16 +447,28 @@ namespace BizHawk.Emulation.Consoles.Nintendo
private void SetupMemoryDomains()
{
var domains = new List<MemoryDomain>(6);
var MainMemoryDomain = new MemoryDomain("Main RAM", ram.Length, Endian.Little,
addr => ram[addr & 0x07FF], (addr, value) => ram[addr & 0x07FF] = value);
//System bus
//PPU 2000-3FFF
//APU 4000-5FFF
//WRAM 6000-7FFF
//PRG RAM 8000-FFFF
var domains = new List<MemoryDomain>();
var WRAM = new MemoryDomain("WRAM", ram.Length, Endian.Little,
addr => ram[addr & ram.Length], (addr, value) => ram[addr &ram.Length] = value);
var MainMemory = new MemoryDomain("System Bus", 0x10000, Endian.Little,
addr => ReadMemory((ushort)addr), (addr, value) => WriteMemory((ushort)addr, value));
var PPUBus = new MemoryDomain("PPU Bus", 0x4000, Endian.Little,
addr => ppu.ppubus_read(addr), (addr, value) => ppu.ppubus_write(addr, value));
//TODO: board PRG, PRAM & SaveRAM, or whatever useful things from the board
domains.Add(MainMemoryDomain);
domains.Add(WRAM);
domains.Add(MainMemory);
domains.Add(PPUBus);
if (board.SaveRam != null)
{
var BatteryRam = new MemoryDomain("Battery RAM", board.SaveRam.Length, Endian.Little,
addr => board.SaveRam[addr & board.SaveRam.Length], (addr, value) => board.SaveRam[addr & SaveRam.Length] = value);
domains.Add(BatteryRam);
}
memoryDomains = domains.AsReadOnly();
}

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

@ -14,13 +14,13 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public partial class PPU
{
//when the ppu issues a write it goes through here and into the game board
void ppubus_write(int addr, byte value)
public void ppubus_write(int addr, byte value)
{
nes.board.WritePPU(addr, value);
}
//when the ppu issues a read it goes through here and into the game board
byte ppubus_read(int addr)
public byte ppubus_read(int addr)
{
return nes.board.ReadPPU(addr);
}