mirror of
https://github.com/dborth/fceugx.git
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86 lines
2.1 KiB
C++
86 lines
2.1 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 cregs[4], pregs[2];
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static uint8 IRQCount, IRQa;
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static SFORMAT StateRegs[] =
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{
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{ cregs, 4, "CREG" },
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{ pregs, 2, "PREG" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 1, "IRQC" },
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{ 0 }
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};
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static void Sync(void) {
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setprg8(0x8000, pregs[0]);
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setprg8(0xa000, pregs[1]);
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setprg8(0xc000, ~1);
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setprg8(0xe000, ~0);
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setchr2(0x0000, cregs[0]);
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setchr2(0x0800, cregs[1]);
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setchr2(0x1000, cregs[2]);
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setchr2(0x1800, cregs[3]);
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}
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static DECLFW(M91Write0) {
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cregs[A & 3] = V;
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Sync();
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}
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static DECLFW(M91Write1) {
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switch (A & 3) {
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case 0:
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case 1: pregs[A & 1] = V; Sync(); break;
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case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;
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}
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}
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static void M91Power(void) {
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Sync();
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SetWriteHandler(0x6000, 0x6fff, M91Write0);
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SetWriteHandler(0x7000, 0x7fff, M91Write1);
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SetReadHandler(0x8000, 0xffff, CartBR);
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}
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static void M91IRQHook(void) {
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if (IRQCount < 8 && IRQa) {
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IRQCount++;
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if (IRQCount >= 8) {
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X6502_IRQBegin(FCEU_IQEXT);
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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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Sync();
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}
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void Mapper91_Init(CartInfo *info) {
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info->Power = M91Power;
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GameHBIRQHook = M91IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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