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NES - start mapper 245 prg mapping working (possibly)

This commit is contained in:
andres.delikat 2012-07-23 22:15:22 +00:00
parent ae291162e1
commit b08c2861a4
3 changed files with 107 additions and 1 deletions
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1
BizHawk.Emulation/BizHawk.Emulation.csproj
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@ -191,6 +191,7 @@
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper191.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper192.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper205.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper245.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\MMC3.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\NES-QJ.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\TQROM.cs" />

2
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3.cs
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@ -30,7 +30,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
int irq_countdown;
//volatile state
ByteBuffer chr_regs_1k = new ByteBuffer(8);
public ByteBuffer chr_regs_1k = new ByteBuffer(8);
ByteBuffer prg_regs_8k = new ByteBuffer(4);
//configuration

105
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper245.cs Normal file
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@ -0,0 +1,105 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace BizHawk.Emulation.Consoles.Nintendo
{
class Mapper245 : MMC3Board_Base
{
/*
Here are Disch's original notes:
========================
= Mapper 245 =
========================
Example Games:
--------------------------
Chu Han Zheng Ba - The War Between Chu & Han
Xing Ji Wu Shi - Super Fighter
Yin He Shi Dai
Yong Zhe Dou e Long - Dragon Quest VII (As)
Dong Fang de Chuan Shuo - The Hyrule Fantasy
Notes:
---------------------------
Another ?Chinese? MMC3 clone. Very similar to your typical MMC3. For MMC3 info, see mapper 004.
Register layout is identical to a typical MMC3.
CHR Setup:
---------------------------
CHR-RAM is not swappable. When there is no CHR-ROM present, 8k CHR-RAM is fixed. However the CHR Mode bit
($8000.7) can still "flip" the left/right pattern tables.
Example:
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00
+-------------------------------+-------------------------------+
CHR-RAM, Mode 0: | { 0 } | { 1 } |
+-------------------------------+-------------------------------+
CHR-RAM, Mode 1: | { 1 } | { 0 } |
+---------------------------------------------------------------+
CHR-ROM: | Typical MMC3 |
+---------------------------------------------------------------+
PRG Setup:
---------------------------
PRG Setup is the same as a normal MMC3, although there's a PRG-AND of $3F, and games select a 512k Block with
bit 1 of R:0. Pretty simple really:
R:0: [.... ..P.]
'P' PRG-AND PRG-OR
--------------------------
0 $3F $00
1 $3F $40
R:0 remains the normal MMC3 CHR reg, as well. Although the game that uses it as a PRG block selector ("DQ7")
uses CHR-RAM, so it is normally ignored.
*/
public override bool Configure(NES.EDetectionOrigin origin)
{
//analyze board type
switch (Cart.board_type)
{
case "MAPPER245":
break;
default:
return false;
}
BaseSetup();
return true;
}
public override byte ReadPRG(int addr)
{
int bank_8k = Get_PRGBank_8K(addr);
bank_8k &= 0x3F;
bank_8k &= prg_mask;
int reg0 = ((base.mmc3.chr_regs_1k[0] >> 1) & 0x01);
if (reg0 == 1)
{
addr |= 0x40;
}
else
{
addr |= 0x00;
}
addr = (bank_8k << 13) | (addr & 0x1FFF);
return ROM[addr];
}
}
}