mirror of
https://github.com/dborth/fceugx.git
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140 lines
3.1 KiB
C++
140 lines
3.1 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) 2002 Xodnizel
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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 cmd, mirr, regs[11];
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static uint8 rmode, IRQmode, IRQCount, IRQa, IRQLatch;
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static SFORMAT StateRegs[] = {
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{ regs, 11, "REGS" },
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{ &cmd, 1, "CMDR" },
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{ &mirr, 1, "MIRR" },
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{ &rmode, 1, "RMOD" },
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{ &IRQmode, 1, "IRQM" },
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{ &IRQCount, 1, "IRQC" },
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{ &IRQa, 1, "IRQA" },
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{ &IRQLatch, 1, "IRQL" },
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{ 0 }
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};
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static void M64IRQHook(int a) {
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static int32 smallcount;
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if (IRQmode) {
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smallcount += a;
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while (smallcount >= 4) {
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smallcount -= 4;
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IRQCount--;
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if (IRQCount == 0xFF)
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if (IRQa) X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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static void M64HBHook(void) {
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if ((!IRQmode) && (scanline != 240)) {
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rmode = 0;
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IRQCount--;
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if (IRQCount == 0xFF) {
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if (IRQa) {
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rmode = 1;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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}
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static void Sync(void) {
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if (cmd & 0x20) {
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setchr1(0x0000, regs[0]);
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setchr1(0x0400, regs[8]);
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setchr1(0x0800, regs[1]);
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setchr1(0x0C00, regs[9]);
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} else {
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setchr2(0x0000, regs[0] >> 1);
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setchr2(0x0800, regs[1] >> 1);
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}
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setchr1(0x1000, regs[2]);
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setchr1(0x1400, regs[3]);
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setchr1(0x1800, regs[4]);
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setchr1(0x1C00, regs[5]);
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setprg8(0x8000, regs[6]);
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setprg8(0xA000, regs[7]);
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setprg8(0xC000, regs[10]);
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setprg8(0xE000, ~0);
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setmirror(mirr);
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}
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static DECLFW(M64Write) {
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switch (A & 0xF001) {
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case 0xA000: mirr = (V & 1) ^ 1; Sync(); break;\
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case 0x8000: cmd = V; break;
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case 0x8001:
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if ((cmd & 0xF) < 10)
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regs[cmd & 0xF] = V;
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else if ((cmd & 0xF) == 0xF)
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regs[10] = V;
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Sync();
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break;
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case 0xC000:
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IRQLatch = V;
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if (rmode == 1)
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IRQCount = IRQLatch;
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break;
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case 0xC001:
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rmode = 1;
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IRQCount = IRQLatch;
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IRQmode = V & 1;
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break;
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case 0xE000:
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IRQa = 0;
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X6502_IRQEnd(FCEU_IQEXT);
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if (rmode == 1)
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IRQCount = IRQLatch;
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break;
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case 0xE001:
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IRQa = 1;
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if (rmode == 1)
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IRQCount = IRQLatch;
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break;
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}
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}
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static void M64Power(void) {
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cmd = mirr = 0;
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regs[0] = regs[1] = regs[2] = regs[3] = regs[4] = regs[5] = ~0;
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regs[6] = regs[7] = regs[8] = regs[9] = regs[10] = ~0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M64Write);
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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 Mapper64_Init(CartInfo *info) {
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info->Power = M64Power;
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GameHBIRQHook = M64HBHook;
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MapIRQHook = M64IRQHook;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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