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74 lines
2.2 KiB
C++
74 lines
2.2 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) 2009 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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* 7-in-1 Darkwing Duck, Snake, MagicBlock (PCB marked as "12 in 1")
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* 12-in-1 1991 New Star Co. Ltd.
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*
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*/
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#include "mapinc.h"
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static uint8 prgchr[2], ctrl;
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static SFORMAT StateRegs[] =
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{
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{ prgchr, 2, "REGS" },
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{ &ctrl, 1, "CTRL" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 bank = (ctrl & 3) << 3;
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setchr4(0x0000, (prgchr[0] >> 3) | (bank << 2));
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setchr4(0x1000, (prgchr[1] >> 3) | (bank << 2));
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if (ctrl & 8) {
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setprg16(0x8000, bank | (prgchr[0] & 6) | 0); // actually, both 0 and 1 registers used, but they will switch each PA12 transition
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setprg16(0xc000, bank | (prgchr[0] & 6) | 1); // if bits are different for both registers, so they must be programmed strongly the same!
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} else {
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setprg16(0x8000, bank | (prgchr[0] & 7));
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setprg16(0xc000, bank | 7 );
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}
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setmirror(((ctrl & 4) >> 2) ^ 1);
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}
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static DECLFW(BMC12IN1Write) {
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switch (A & 0xE000) {
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case 0xA000: prgchr[0] = V; Sync(); break;
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case 0xC000: prgchr[1] = V; Sync(); break;
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case 0xE000: ctrl = V & 0x0F; Sync(); break;
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}
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}
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static void BMC12IN1Power(void) {
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prgchr[0] = prgchr[1] = ctrl = 0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, BMC12IN1Write);
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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 BMC12IN1_Init(CartInfo *info) {
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info->Power = BMC12IN1Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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