mirror of
https://github.com/dborth/fceugx.git
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94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
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/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2005 CaH4e3
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static uint8 cmdin;
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static uint8 UNL8237_perm[8] = {0, 2, 6, 1, 7, 3, 4, 5};
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static void UNL8237CW(uint32 A, uint8 V)
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{
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setchr1(A,((EXPREGS[1]&4)<<6)|V);
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}
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static void UNL8237PW(uint32 A, uint8 V)
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{
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if(EXPREGS[0]&0x80)
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{
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if(EXPREGS[0]&0x20)
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setprg32(0x8000,(EXPREGS[0]&0xF)>>1);
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else
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{
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setprg16(0x8000,(EXPREGS[0]&0x1F));
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setprg16(0xC000,(EXPREGS[0]&0x1F));
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}
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}
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else
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setprg8(A,V&0x3F);
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}
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static DECLFW(UNL8237Write)
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{
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if((A&0xF000)==0xF000)
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IRQCount=V;
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else if((A&0xF000)==0xE000)
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X6502_IRQEnd(FCEU_IQEXT);
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else switch(A&0xE001)
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{
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case 0x8000: setmirror(((V|(V>>7))&1)^1); break;
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case 0xA000: MMC3_CMDWrite(0x8000,(V&0xC0)|(UNL8237_perm[V&7])); cmdin=1; break;
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case 0xC000: if(cmdin)
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{
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MMC3_CMDWrite(0x8001,V);
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cmdin=0;
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}
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break;
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}
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}
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static DECLFW(UNL8237ExWrite)
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{
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switch(A)
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{
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case 0x5000: EXPREGS[0]=V; FixMMC3PRG(MMC3_cmd); break;
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case 0x5001: EXPREGS[1]=V; FixMMC3CHR(MMC3_cmd); break;
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}
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}
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static void UNL8237Power(void)
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{
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IRQa=1;
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EXPREGS[0]=EXPREGS[1]=0;
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GenMMC3Power();
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SetWriteHandler(0x8000,0xFFFF,UNL8237Write);
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SetWriteHandler(0x5000,0x7FFF,UNL8237ExWrite);
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}
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void UNL8237_Init(CartInfo *info)
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{
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GenMMC3_Init(info, 256, 256, 0, 0);
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cwrap=UNL8237CW;
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pwrap=UNL8237PW;
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info->Power=UNL8237Power;
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AddExState(EXPREGS, 3, 0, "EXPR");
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AddExState(&cmdin, 1, 0, "CMDIN");
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}
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