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nes-add HKROM mmc6 (startropics)

This commit is contained in:
zeromus 2011-10-14 09:27:22 +00:00
parent e801025d0f
commit d2aba72502
2 changed files with 110 additions and 0 deletions
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1
BizHawk.Emulation/BizHawk.Emulation.csproj
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@ -115,6 +115,7 @@
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper242.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper078.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\DRROM.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\HKROM.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper095.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper206.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\MMC3_family.cs" />

109
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/HKROM.cs Normal file
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@ -0,0 +1,109 @@
using System;
using System.IO;
using System.Diagnostics;
namespace BizHawk.Emulation.Consoles.Nintendo
{
//aka MMC6 aka StarTropics and StarTropics 2
//for simplicity's sake, the behaviour of mmc6 is wrapped up into this board since it isnt used anywhere else
public class HKROM : MMC3Board_Base
{
//configuration
//state
bool wram_enabled;
bool wram_h_enabled, wram_l_enabled;
bool wram_h_enabled_write, wram_l_enabled_write;
public override bool Configure(NES.EDetectionOrigin origin)
{
//analyze board type
switch (Cart.board_type)
{
case "NES-HKROM":
AssertPrg(256); AssertChr(256); AssertVram(0); AssertWram(0,1);
Cart.wram_size = 1; //1K of wram is in the mmc6
Cart.wram_battery = true; //and its battery backed.
break;
default:
return false;
}
BaseSetup();
return true;
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("wram_enabled", ref wram_enabled);
ser.Sync("wram_h_enabled", ref wram_h_enabled);
ser.Sync("wram_l_enabled", ref wram_l_enabled);
ser.Sync("wram_h_enabled_write", ref wram_h_enabled_write);
ser.Sync("wram_l_enabled_write", ref wram_l_enabled_write);
}
public override void WritePRG(int addr, byte value)
{
switch (addr & 0x6001)
{
case 0x0000: //$8000
//an extra wram enabled bit is here
wram_enabled = value.Bit(5);
if (!wram_enabled)
{
wram_h_enabled = wram_l_enabled = false;
wram_h_enabled_write = wram_l_enabled_write = false;
}
break;
case 0x2001: //$A001
//a whole host of wram configurations
if (wram_enabled)
{
wram_h_enabled = value.Bit(7);
wram_l_enabled = value.Bit(5);
wram_h_enabled_write = value.Bit(6);
wram_l_enabled_write = value.Bit(6);
}
break;
}
base.WritePRG(addr, value);
}
public override void WriteWRAM(int addr, byte value)
{
if (addr < 0x1000)
return;
addr &= (1 << 10) - 1;
int block = addr >> 9;
bool block_enabled = (block == 1) ? wram_h_enabled : wram_l_enabled;
bool write_enabled = (block == 1) ? wram_h_enabled_write : wram_l_enabled_write;
if (write_enabled)
base.WriteWRAM(addr, value);
}
public override byte ReadWRAM(int addr)
{
byte open_bus = 0xFF; //open bus
if (addr < 0x1000)
return open_bus;
addr &= (1 << 10) - 1;
int block = addr >> 9;
bool block_enabled = (block == 1) ? wram_h_enabled : wram_l_enabled;
bool write_enabled = (block == 1) ? wram_h_enabled_write : wram_l_enabled_write;
if (!wram_h_enabled && wram_l_enabled)
return open_bus;
if (block_enabled)
return base.ReadWRAM(addr);
else return 0;
}
}
}