BizHawk/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/UxROM.cs

102 lines
2.1 KiB
C#

using System;
using System.IO;
using System.Diagnostics;
namespace BizHawk.Emulation.Consoles.Nintendo
{
//generally mapper2
//Mega Man
//Castlevania
//Contra
//Duck Tales
//Metal Gear
//TODO - look for a mirror=H UNROM--maybe there are none? this may be fixed to the board type.
[NES.INESBoardImplPriority]
public class UxROM : NES.NESBoardBase
{
//configuration
int prg_mask;
int vram_byte_mask;
Func<int, int> adjust_prg;
//state
int prg;
public override bool Configure(NES.EDetectionOrigin origin)
{
adjust_prg = (x) => x;
//configure
switch (Cart.board_type)
{
case "MAPPER002":
break;
case "NES-UNROM": //mega man
case "HVC-UNROM":
case "KONAMI-UNROM":
AssertPrg(128); AssertChr(0); AssertVram(8);
//AssertWram(0); //JJ - Tobidase Daisakusen Part 2 (J) includes WRAM
break;
case "HVC-UN1ROM":
AssertPrg(128); AssertChr(0); AssertWram(0); AssertVram(8);
adjust_prg = (x) => ((x >> 2) & 7);
break;
case "NES-UOROM": //paperboy 2
case "HVC-UOROM":
AssertPrg(256); AssertChr(0); AssertVram(8); AssertWram(0);
break;
default:
return false;
}
//these boards always have 8KB of VRAM
vram_byte_mask = (Cart.vram_size*1024) - 1;
prg_mask = (Cart.prg_size / 16) - 1;
SetMirrorType(Cart.pad_h, Cart.pad_v);
return true;
}
public override byte ReadPRG(int addr)
{
int block = addr >> 14;
int page = block == 1 ? prg_mask : prg;
int ofs = addr & 0x3FFF;
return ROM[(page << 14) | ofs];
}
public override void WritePRG(int addr, byte value)
{
prg = adjust_prg(value) & prg_mask;
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
return VRAM[addr & vram_byte_mask];
}
else return base.ReadPPU(addr);
}
public override void WritePPU(int addr, byte value)
{
if (addr < 0x2000)
{
VRAM[addr & vram_byte_mask] = value;
}
else base.WritePPU(addr,value);
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("prg", ref prg);
}
}
}