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71 lines
1.9 KiB
C++
71 lines
1.9 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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* VRC-1
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*
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*/
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#include "mapinc.h"
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static uint8 preg[3], creg[2], mode;
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static SFORMAT StateRegs[] =
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{
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{ &mode, 1, "MODE" },
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{ creg, 2, "CREG" },
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{ preg, 3, "PREG" },
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{ 0 }
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};
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static void Sync(void) {
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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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setchr4(0x0000, creg[0] | ((mode & 2) << 3));
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setchr4(0x1000, creg[1] | ((mode & 4) << 2));
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setmirror((mode & 1) ^ 1);
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}
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static DECLFW(M75Write) {
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switch (A & 0xF000) {
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case 0x8000: preg[0] = V; Sync(); break;
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case 0x9000: mode = 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 0xE000: creg[0] = V & 0xF; Sync(); break;
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case 0xF000: creg[1] = V & 0xF; Sync(); break;
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}
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}
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static void M75Power(void) {
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Sync();
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SetWriteHandler(0x8000, 0xFFFF, M75Write);
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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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 Mapper75_Init(CartInfo *info) {
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info->Power = M75Power;
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AddExState(&StateRegs, ~0, 0, 0);
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GameStateRestore = StateRestore;
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}
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