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NES - Mapper 90 - Implement CHR Latch Logic, makes Punch-Out (Unl.) and various others playable.

This commit is contained in:
scrimpeh 2015-09-24 21:06:11 +02:00
parent 1e67943b99
commit 62ba39b633
1 changed files with 26 additions and 4 deletions
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30
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper090.cs
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@ -12,6 +12,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
IntBuffer prg_banks = new IntBuffer(4);
IntBuffer chr_banks = new IntBuffer(8);
IntBuffer chr_latches = new IntBuffer(2);
ByteBuffer ram_bytes = new ByteBuffer(5);
@ -109,6 +110,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
chr_regs[i] = 0xFFFF;
}
chr_latches[0] = 0;
chr_latches[1] = 4;
AutoMapperProps.Apply(this);
Sync();
@ -120,6 +124,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
ser.Sync("prg_regs", ref prg_regs);
ser.Sync("chr_regs", ref chr_regs);
ser.Sync("chr_latches", ref chr_latches);
ser.Sync("nt_regs", ref nt_regs);
ser.Sync("prg_banks", ref prg_banks);
@ -172,6 +177,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
prg_regs.Dispose();
chr_regs.Dispose();
chr_latches.Dispose();
nt_regs.Dispose();
prg_banks.Dispose();
chr_banks.Dispose();
@ -287,8 +293,11 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
SetBank(chr_banks, 0, 8, ((chr_regs[0] & mask) | block) << 3);
break;
case 1:
SetBank(chr_banks, 0, 4, ((chr_regs[0] & mask) | block) << 2);
SetBank(chr_banks, 4, 4, ((chr_regs[4] & mask) | block) << 2);
var reg_0 = mapper_090 ? chr_regs[0] : chr_regs[chr_latches[0]];
var reg_1 = mapper_090 ? chr_regs[4] : chr_regs[chr_latches[1]];
SetBank(chr_banks, 0, 4, ((reg_0 & mask) | block) << 2);
SetBank(chr_banks, 4, 4, ((reg_1 & mask) | block) << 2);
break;
case 2:
SetBank(chr_banks, 0, 2, ((chr_regs[0] & mask) | block) << 1);
@ -419,7 +428,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
xor_reg = value;
break;
case 0x4007: //IRQ prescaler adjust
//Poorly understood, and no games actually appear to use it.
//Poorly understood, and no game actually appears to use it.
//We therefore forego emulating it.
break;
@ -563,7 +572,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
if((prescaler & mask) == mask)
{
irq_counter--;
if(irq_counter == 0xFF)
if (irq_counter == 0xFF)
{
irq_pending = irq_enable;
}
@ -637,6 +646,19 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
bank &= chr_bank_mask_1k;
int offset = addr & 0x3FF;
//Super Strange MMC2 logic
int side = addr >> 12;
int tile = addr & 0xFF8;
switch (tile)
{
case 0xFD8:
case 0xFE8:
chr_latches[side] = (addr >> 4) & ((side << 2) | 0x2);
SyncCHRBanks();
break;
}
return VROM[bank << 10 | offset];
}