57 lines
1.2 KiB
C#
57 lines
1.2 KiB
C#
namespace BizHawk.Emulation.Cores.Nintendo.NES
|
|
{
|
|
// what is this?
|
|
internal sealed class Mapper029 : NesBoardBase
|
|
{
|
|
int prg;
|
|
int chr;
|
|
int prg_bank_mask_16k;
|
|
|
|
public override bool Configure(EDetectionOrigin origin)
|
|
{
|
|
switch (Cart.BoardType)
|
|
{
|
|
case "Mapper029":
|
|
case "UNIF_JERKFACE":
|
|
case "UNIF_RET-CUFROM":
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
SetMirrorType(EMirrorType.Vertical);
|
|
AssertChr(0);
|
|
AssertPrg(32, 64, 128, 256, 512, 1024);
|
|
Cart.WramSize = 8;
|
|
Cart.VramSize = 32;
|
|
prg_bank_mask_16k = Cart.PrgSize / 16 - 1;
|
|
return true;
|
|
}
|
|
|
|
public override void WritePrg(int addr, byte value)
|
|
{
|
|
chr = value & 3;
|
|
prg = (value >> 2) & prg_bank_mask_16k;
|
|
}
|
|
|
|
public override byte ReadPrg(int addr)
|
|
{
|
|
int bank = addr >= 0x4000 ? prg_bank_mask_16k : prg;
|
|
return Rom[bank << 14 | addr & 0x3fff];
|
|
}
|
|
public override byte ReadPpu(int addr)
|
|
{
|
|
if (addr < 0x2000)
|
|
return Vram[addr | chr << 13];
|
|
else
|
|
return base.ReadPpu(addr);
|
|
}
|
|
public override void WritePpu(int addr, byte value)
|
|
{
|
|
if (addr < 0x2000)
|
|
Vram[addr | chr << 13] = value;
|
|
else
|
|
base.WritePpu(addr, value);
|
|
}
|
|
}
|
|
}
|