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Fix Mapper 219 

Note: I don't know how or if this game works. It behaves the same as on any other emulator though.
This commit is contained in:
alyosha-tas 2016-09-24 12:54:21 -04:00 committed by GitHub
parent c2f545faf5
commit 1d479559c7
1 changed files with 121 additions and 1 deletions
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120
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper219.cs
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@ -2,6 +2,12 @@
{
public sealed class Mapper219 : MMC3Board_Base
{
public byte[] exregs = new byte[3];
public byte[] prgregs = new byte[4];
public byte[] chrregs = new byte[8];
public byte bits_rev, reg_value;
public override bool Configure(NES.EDetectionOrigin origin)
{
switch (Cart.board_type)
@ -13,7 +19,121 @@
}
BaseSetup();
prgregs[1] = 1;
prgregs[2] = 2;
prgregs[3] = 3;
byte r0_0 = (byte)(0 & ~1);
byte r0_1 = (byte)(0 | 1);
byte r1_0 = (byte)(2 & ~1);
byte r1_1 = (byte)(2 | 1);
chrregs[0] = 4;
chrregs[1] = 5;
chrregs[2] = 6;
chrregs[3] = 7;
chrregs[4] = r0_0;
chrregs[5] = r0_1;
chrregs[6] = r1_0;
chrregs[7] = r1_1;
/*
chr_regs_1k[0] = r0_0;
chr_regs_1k[1] = r0_1;
chr_regs_1k[2] = r1_0;
chr_regs_1k[3] = r1_1;
chr_regs_1k[4] = regs[2];
chr_regs_1k[5] = regs[3];
chr_regs_1k[6] = regs[4];
chr_regs_1k[7] = regs[5];*/
return true;
}
public override void WritePRG(int addr, byte value)
{
if (addr<0x2000)
{
switch ((addr + 0x8000) & 0xE003)
{
case 0x8000:
exregs[1] = value;
exregs[0] = 0;
break;
case 0x8002:
exregs[0] = value;
exregs[1] = 0;
break;
case 0x8001:
reg_value = value;
bits_rev = (byte)(((value & 0x20) >> 5) | ((value & 0x10) >> 3) | ((value & 0x08) >> 1) | ((value & 0x04) << 1));
switch (exregs[0])
{
case 0x26: prgregs[0] = bits_rev; break;
case 0x25: prgregs[1] = bits_rev; break;
case 0x24: prgregs[2] = bits_rev; break;
case 0x23: prgregs[3] = bits_rev; break;
}
switch (exregs[1])
{
case 0x08:
case 0x0A:
case 0x0E:
case 0x12:
case 0x16:
case 0x1A:
case 0x1E: exregs[2] = (byte)(value << 4); break;
case 0x09: chrregs[0] = (byte)(exregs[2] | (value >> 1 & 0xE)); break;
case 0x0b: chrregs[1] = (byte)(exregs[2] | (value >> 1) | 1); break;
case 0x0c:
case 0x0d: chrregs[2] = (byte)(exregs[2] | (value >> 1 & 0xE)); break;
case 0x0f: chrregs[3] = (byte)(exregs[2] | (value >> 1) | 1); break;
case 0x10:
case 0x11: chrregs[4] = (byte)(exregs[2] | (value >> 1)); break;
case 0x14:
case 0x15: chrregs[5] = (byte)(exregs[2] | (value >> 1)); break;
case 0x18:
case 0x19: chrregs[6] = (byte)(exregs[2] | (value >> 1)); break;
case 0x1c:
case 0x1d: chrregs[7] = (byte)(exregs[2] | (value >> 1)); break;
}
break;
}
}
else
base.WritePRG(addr, value);
}
public override byte ReadPRG(int addr)
{
int bank_prg = addr >> 13;
bank_prg = prgregs[bank_prg];
return ROM[((bank_prg << 13) + (addr & 0x1FFF))];
}
public override byte ReadPPU(int addr)
{
if (addr<0x2000)
{
int bank_chr = addr >> 10;
bank_chr = chrregs[bank_chr];
return VRAM[((bank_chr << 10) + (addr & 0x3FF))];
}
else
return base.ReadPPU(addr);
}
public override void WritePPU(int addr, byte value)
{
if (addr < 0x2000)
{
int bank_chr = addr >> 10;
bank_chr = chrregs[bank_chr];
VRAM[((bank_chr << 10) + (addr & 0x3FF))]=value;
}
else
base.WritePPU(addr, value);
}
}
}