mirror of
https://github.com/dborth/fceugx.git
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120 lines
2.6 KiB
C++
120 lines
2.6 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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static uint8 preg[4], creg[8];
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static uint8 IRQa, mirr;
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static int32 IRQCount, IRQLatch;
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static SFORMAT StateRegs[]=
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{
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{preg, 4, "PREG"},
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{creg, 8, "CREG"},
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{&mirr, 1, "MIRR"},
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{&IRQa, 1, "IRQA"},
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{&IRQCount, 4, "IRQC"},
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{&IRQLatch, 4, "IRQL"},
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{0}
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};
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static void Sync(void)
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{
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int i;
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for(i=0; i<8; i++) setchr1(i<<10,creg[i]);
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setprg8(0x8000,preg[0]);
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setprg8(0xA000,preg[1]);
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setprg8(0xC000,preg[2]);
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setprg8(0xE000,preg[3]);
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switch(mirr) {
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case 0: setmirror(MI_0); break;
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case 1: setmirror(MI_1); break;
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case 2: setmirror(MI_H); break;
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case 3: setmirror(MI_V); break;
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}
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}
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static DECLFW(M17WriteMirr)
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{
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mirr = ((A << 1) & 2)|((V >> 4) & 1);
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Sync();
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}
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static DECLFW(M17WriteIRQ)
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{
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switch(A) {
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case 0x4501: IRQa=0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0x4502: IRQCount&=0xFF00; IRQCount|=V; break;
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case 0x4503: IRQCount&=0x00FF; IRQCount|=V<<8; IRQa=1; break;
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}
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}
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static DECLFW(M17WritePrg)
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{
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preg[A & 3] = V;
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Sync();
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}
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static DECLFW(M17WriteChr)
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{
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creg[A & 7] = V;
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Sync();
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}
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static void M17Power(void)
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{
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preg[3] = ~0;
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Sync();
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SetReadHandler(0x8000,0xFFFF,CartBR);
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SetWriteHandler(0x42FE,0x42FF,M17WriteMirr);
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SetWriteHandler(0x4500,0x4503,M17WriteIRQ);
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SetWriteHandler(0x4504,0x4507,M17WritePrg);
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SetWriteHandler(0x4510,0x4517,M17WriteChr);
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}
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static void M17IRQHook(int a)
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{
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if(IRQa)
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{
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IRQCount+=a;
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if(IRQCount>=0x10000)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa=0;
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IRQCount=0;
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}
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}
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}
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static void StateRestore(int version)
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{
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Sync();
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}
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void Mapper17_Init(CartInfo *info)
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{
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info->Power=M17Power;
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MapIRQHook=M17IRQHook;
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GameStateRestore=StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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