mirror of
https://github.com/dborth/fceugx.git
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105 lines
2.8 KiB
C++
105 lines
2.8 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) 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[3], creg[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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{ preg, 3, "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, 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, preg[0]);
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setprg8(0xA000, preg[1]);
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setprg8(0xC000, preg[2]);
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setprg8(0xE000, ~0);
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setchr1(0x0000, creg[0]);
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setchr1(0x0400, creg[1]);
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setchr1(0x0800, creg[2]);
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setchr1(0x0C00, creg[3]);
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setchr1(0x1000, creg[4]);
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setchr1(0x1400, creg[5]);
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setchr1(0x1800, creg[6]);
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setchr1(0x1C00, creg[7]);
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setmirror(mirr);
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}
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static DECLFW(M65Write) {
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switch (A) {
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case 0x8000: preg[0] = V; Sync(); break;
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case 0xA000: preg[1] = V; Sync(); break;
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case 0xC000: preg[2] = V; Sync(); break;
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case 0x9001: mirr = ((V >> 7) & 1) ^ 1; Sync(); break;
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case 0x9003: IRQa = V & 0x80; X6502_IRQEnd(FCEU_IQEXT); break;
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case 0x9004: IRQCount = IRQLatch; break;
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case 0x9005: IRQLatch &= 0x00FF; IRQLatch |= V << 8; break;
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case 0x9006: IRQLatch &= 0xFF00; IRQLatch |= V; break;
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case 0xB000: creg[0] = V; Sync(); break;
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case 0xB001: creg[1] = V; Sync(); break;
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case 0xB002: creg[2] = V; Sync(); break;
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case 0xB003: creg[3] = V; Sync(); break;
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case 0xB004: creg[4] = V; Sync(); break;
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case 0xB005: creg[5] = V; Sync(); break;
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case 0xB006: creg[6] = V; Sync(); break;
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case 0xB007: creg[7] = V; Sync(); break;
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}
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}
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static void M65Power(void) {
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preg[2] = ~1;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M65Write);
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}
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void M65IRQ(int a) {
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if (IRQa) {
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IRQCount -= a;
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if (IRQCount < -4) {
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa = 0;
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IRQCount = -1;
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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 Mapper65_Init(CartInfo *info) {
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info->Power = M65Power;
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MapIRQHook = M65IRQ;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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