mirror of
https://github.com/dborth/fceugx.git
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106 lines
2.6 KiB
C++
106 lines
2.6 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, creg[4], mirr, suntoggle = 0;
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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, 1, "PREG" },
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{ &suntoggle, 1, "STOG" },
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{ creg, 4, "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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setprg16(0x8000, preg);
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setprg16(0xC000, ~0);
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setchr2(0x0000, creg[0]);
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setchr2(0x0800, creg[1]);
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setchr2(0x1000, creg[2]);
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setchr2(0x1800, creg[3]);
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switch (mirr) {
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case 0: setmirror(MI_V); break;
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case 1: setmirror(MI_H); break;
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case 2: setmirror(MI_0); break;
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case 3: setmirror(MI_1); break;
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}
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}
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static DECLFW(M67Write) {
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switch (A & 0xF800) {
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case 0x8800: creg[0] = V; Sync(); break;
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case 0x9800: creg[1] = V; Sync(); break;
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case 0xA800: creg[2] = V; Sync(); break;
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case 0xB800: creg[3] = V; Sync(); break;
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case 0xC000:
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case 0xC800:
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IRQCount &= 0xFF << (suntoggle << 3);
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IRQCount |= V << ((suntoggle ^ 1) << 3);
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suntoggle ^= 1;
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break;
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case 0xD800:
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suntoggle = 0;
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IRQa = V & 0x10;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 0xE800: mirr = V & 3; Sync(); break;
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case 0xF800: preg = V; Sync(); break;
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}
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}
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static void M67Power(void) {
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suntoggle = 0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M67Write);
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}
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void M67IRQ(int a) {
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if (IRQa) {
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IRQCount -= a;
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if (IRQCount <= 0) {
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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 Mapper67_Init(CartInfo *info) {
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info->Power = M67Power;
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MapIRQHook = M67IRQ;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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