mirror of
https://github.com/dborth/fceugx.git
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118 lines
3.0 KiB
C++
118 lines
3.0 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 is48;
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static uint8 regs[8], mirr;
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static uint8 IRQa;
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static int16 IRQCount, IRQLatch;
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static SFORMAT StateRegs[] =
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{
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{ regs, 8, "PREG" },
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{ &mirr, 1, "MIRR" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQCount, 2, "IRQC" },
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{ &IRQLatch, 2, "IRQL" },
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{ 0 }
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};
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static void Sync(void) {
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setmirror(mirr);
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setprg8(0x8000, regs[0]);
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setprg8(0xA000, regs[1]);
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setprg8(0xC000, ~1);
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setprg8(0xE000, ~0);
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setchr2(0x0000, regs[2]);
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setchr2(0x0800, regs[3]);
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setchr1(0x1000, regs[4]);
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setchr1(0x1400, regs[5]);
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setchr1(0x1800, regs[6]);
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setchr1(0x1C00, regs[7]);
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}
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static DECLFW(M33Write) {
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A &= 0xF003;
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switch(A) {
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case 0x8000: regs[0] = V & 0x3F; if(!is48) mirr = ((V >> 6) & 1) ^ 1; Sync(); break;
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case 0x8001: regs[1] = V & 0x3F; Sync(); break;
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case 0x8002: regs[2] = V; Sync(); break;
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case 0x8003: regs[3] = V; Sync(); break;
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case 0xA000: regs[4] = V; Sync(); break;
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case 0xA001: regs[5] = V; Sync(); break;
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case 0xA002: regs[6] = V; Sync(); break;
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case 0xA003: regs[7] = V; Sync(); break;
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}
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}
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static DECLFW(M48Write) {
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switch (A & 0xF003) {
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case 0xC000: IRQLatch = V; break;
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case 0xC001: IRQCount = IRQLatch; break;
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case 0xC003: IRQa = 0; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0xC002: IRQa = 1; break;
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case 0xE000: mirr = ((V >> 6) & 1) ^ 1; Sync(); break;
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}
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}
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static void M33Power(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M33Write);
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}
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static void M48Power(void) {
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xBFFF, M33Write);
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SetWriteHandler(0xC000, 0xFFFF, M48Write);
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}
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static void M48IRQ(void) {
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if (IRQa) {
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IRQCount++;
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if (IRQCount == 0x100) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa = 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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Sync();
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}
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void Mapper33_Init(CartInfo *info) {
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is48 = 0;
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info->Power = M33Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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void Mapper48_Init(CartInfo *info) {
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is48 = 1;
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info->Power = M48Power;
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GameHBIRQHook = M48IRQ;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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