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Fixes to mapper 164, Final Fantasy V has a broken title screen but otherwise playable. Implemented based on Disch's original notes and so not quite complete.

This commit is contained in:
adelikat 2012-07-21 18:31:41 +00:00
parent 544410b4d8
commit 8aeb313381
1 changed files with 52 additions and 15 deletions
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67
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper164.cs
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@ -7,11 +7,42 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{
class Mapper164 : NES.NESBoardBase
{
//Mapper 164
//Final Fantasy V (Unl)
/*
* Here are Disch's original notes:
========================
= Mapper 164 =
========================
Example Game:
--------------------------
Final Fantasy V
Registers:
---------------------------
Range,Mask: $5000-FFFF, $F300
$5000, $D000: PRG reg (32k @ $8000)
$6000-7FFF may have SRAM (not sure)
On Reset
---------------------------
Reg seems to contain $FF on powerup/reset
Notes:
---------------------------
Swapping is really simple -- the thing that is funky is the register range/mask. $5000 and $D000 will access
the register, however $5100, $5200, etc will not.
*/
//state
int prg;
int prg_bank;
int prg_bank_mask_32k;
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -22,34 +53,40 @@ namespace BizHawk.Emulation.Consoles.Nintendo
default:
return false;
}
SetMirrorType(Cart.pad_h, Cart.pad_v);
prg = 0xFF;
prg_bank = 0xFF;
prg_bank_mask_32k = Cart.prg_size / 32 - 1;
return true;
}
public override void WriteEXP(int addr, byte value)
{
addr &= 0xF300;
if (addr == 0x5000)
prg = value;
addr = (addr + 0x4000) & 0xF300;
if (addr == 0x5000 || addr == 0xD000)
prg_bank = value;
}
public override void WritePRG(int addr, byte value)
{
addr &= 0xF300;
if (addr == 0xD000)
prg = value;
addr = (addr + 0x8000) & 0xF300;
if (addr == 0x5000 || addr == 0xD000)
prg_bank = value;
}
public override byte ReadPPU(int addr)
public override byte ReadPRG(int addr)
{
return VROM[addr + (prg * 0x8000)];
return ROM[addr + ((prg_bank & prg_bank_mask_32k) * 0x8000)];
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("prg", ref prg);
ser.Sync("prg", ref prg_bank);
}
public override void NESSoftReset()
{
prg_bank = 0xFF;
base.NESSoftReset();
}
}
}