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NES: support Famicom Jump 2, featuring http://www.youtube.com/watch?v=HYMnmymg1n0&t=1m10s

This commit is contained in:
goyuken 2014-01-19 19:55:32 +00:00
parent 634df83724
commit 316a61bbb5
1 changed files with 81 additions and 9 deletions
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90
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/BANDAI-FCG-1.cs
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@ -19,7 +19,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
iNES #157 refers to [6], theoretically.
iNES #159 refers to [3], theoretically.
We try to emulate everything but [5] and [6] here.
We try to emulate everything but [6] here.
Size notes:
chr regs are 8 bit wide and swap 1K at a time, for a max size of 256K chr, always rom.
@ -34,8 +34,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
//configuration
int prg_bank_mask_16k, chr_bank_mask_1k;
bool regs_prg_enable;
bool regs_wram_enable;
bool regs_prg_enable; // can the mapper regs be written to in 8000:ffff?
bool regs_wram_enable; // can the mapper regs be written to in 6000:7fff?
bool jump2 = false; // are we in special mode for the JUMP2 board?
//regenerable state
IntBuffer prg_banks_16k = new IntBuffer(2);
@ -110,6 +111,24 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
regs_wram_enable = true;
eprom = new SEEPROM(true);
break;
case "MAPPER153": // [5]
AssertPrg(512);
AssertChr(0);
Cart.vram_size = 8;
Cart.wram_size = 8;
regs_prg_enable = true;
regs_wram_enable = false;
break;
case "BANDAI-JUMP2": // [5]
AssertPrg(512);
AssertChr(0);
AssertVram(8);
AssertWram(8);
regs_prg_enable = true;
regs_wram_enable = false;
jump2 = true;
break;
default:
return false;
}
@ -129,6 +148,19 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
prg_banks_16k[0] = prg_reg_16k & prg_bank_mask_16k;
prg_banks_16k[1] = 0xFF & prg_bank_mask_16k;
if (jump2)
{
if (regs[0].Bit(0))
{
prg_banks_16k[0] |= 0x10;
prg_banks_16k[1] |= 0x10;
}
else // wouldn't need this, except we aren't &=15 on the prg bank addresses
{
prg_banks_16k[0] &= 0x0f;
prg_banks_16k[1] &= 0x0f;
}
}
}
void WriteReg(int reg, byte value)
@ -145,6 +177,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
case 6:
case 7:
regs[reg] = value;
if (jump2) // in jump2, chr regs are rewired to swap prg
SyncPRG();
break;
case 8:
//NES.LogLine("mapping PRG {0}", value);
@ -188,6 +222,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
addr &= 0xF;
WriteReg(addr, value);
}
else if (jump2)
{
WRAM[addr] = value;
}
}
public override void WritePRG(int addr, byte value)
{
@ -203,10 +241,17 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
// reading any addr in 6000:7fff returns a single bit from the eeprom
// in bit 4.
byte ret = (byte)(NES.DB & 0xef);
if (eprom != null && eprom.ReadBit(NES.DB.Bit(4)))
ret |= 0x10;
return ret;
if (!jump2)
{
byte ret = (byte)(NES.DB & 0xef);
if (eprom != null && eprom.ReadBit(NES.DB.Bit(4)))
ret |= 0x10;
return ret;
}
else
{
return WRAM[addr];
}
}
public override void ClockCPU()
@ -243,8 +288,29 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
return VROM[CalcPPUAddress(addr)];
else return base.ReadPPU(addr);
{
if (jump2)
return VRAM[addr];
else
return VROM[CalcPPUAddress(addr)];
}
else
{
return base.ReadPPU(addr);
}
}
public override void WritePPU(int addr, byte value)
{
if (addr < 0x2000)
{
if (jump2)
VRAM[addr] = value;
}
else
{
base.WritePPU(addr, value);
}
}
public override byte[] SaveRam
@ -253,8 +319,14 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
if (eprom != null)
return eprom.GetSaveRAM();
else if (jump2)
{
return WRAM;
}
else
{
return null;
}
}
}
}