112 lines
2.2 KiB
C#
112 lines
2.2 KiB
C#
using BizHawk.Common;
|
|
|
|
namespace BizHawk.Emulation.Cores.Nintendo.NES
|
|
{
|
|
public sealed class Mapper62 : NES.NESBoardBase
|
|
{
|
|
/*
|
|
Here are Disch's original notes:
|
|
========================
|
|
= Mapper 062 =
|
|
========================
|
|
|
|
Example Game:
|
|
--------------------------
|
|
Super 700-in-1
|
|
|
|
|
|
Registers:
|
|
---------------------------
|
|
|
|
$8000-FFFF: A~[..pp pppp MPOC CCCC]
|
|
[.... ..cc]
|
|
p = Low bits of PRG Reg
|
|
P = High bit of PRG Reg
|
|
c = Low bits of CHR Reg
|
|
C = High bits of CHR Reg
|
|
O = PRG Mode
|
|
M = Mirroring (0=Vert, 1=Horz)
|
|
|
|
|
|
PRG Setup:
|
|
---------------------------
|
|
|
|
|
|
$8000 $A000 $C000 $E000
|
|
+-------------------------------+
|
|
PRG Mode 0: | <$8000> |
|
|
+-------------------------------+
|
|
PRG Mode 1: | $8000 | $8000 |
|
|
+---------------+---------------+
|
|
|
|
|
|
CHR Setup:
|
|
----------------------------
|
|
'C' and 'c' select an 8k page @ $0000
|
|
*/
|
|
bool prg_mode = false;
|
|
int chr_reg;
|
|
int prg_reg;
|
|
|
|
public override bool Configure(NES.EDetectionOrigin origin)
|
|
{
|
|
switch (Cart.board_type)
|
|
{
|
|
case "MAPPER062":
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
SetMirrorType(EMirrorType.Vertical);
|
|
|
|
return true;
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
ser.Sync("prg_reg", ref prg_reg);
|
|
ser.Sync("chr_reg", ref chr_reg);
|
|
ser.Sync("prg_mode", ref prg_mode);
|
|
base.SyncState(ser);
|
|
}
|
|
|
|
public override void WritePRG(int addr, byte value)
|
|
{
|
|
prg_mode = addr.Bit(5);
|
|
if (addr.Bit(7))
|
|
{
|
|
SetMirrorType(EMirrorType.Horizontal);
|
|
}
|
|
else
|
|
{
|
|
SetMirrorType(EMirrorType.Vertical);
|
|
}
|
|
|
|
prg_reg = (addr & 0x40) | ((addr >> 8) & 0x3F);
|
|
chr_reg = ((addr & 0x1F) << 2) | (value & 0x03);
|
|
}
|
|
|
|
public override byte ReadPRG(int addr)
|
|
{
|
|
if (prg_mode == false)
|
|
{
|
|
return ROM[((prg_reg >> 1) * 0x8000) + addr];
|
|
}
|
|
else
|
|
{
|
|
return ROM[(prg_reg * 0x4000) + (addr & 0x3FFF)];
|
|
}
|
|
}
|
|
|
|
public override byte ReadPPU(int addr)
|
|
{
|
|
if (addr < 0x2000)
|
|
{
|
|
return VROM[(chr_reg * 0x2000) + addr];
|
|
}
|
|
return base.ReadPPU(addr);
|
|
}
|
|
}
|
|
}
|