93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2020 negativeExponent
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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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/* NES 2.0 Mapper 390 - Realtec 8031 */
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#include "mapinc.h"
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static uint8 regs[2];
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static uint8 dipswitch;
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static SFORMAT StateRegs[] =
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{
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{ ®s, 2, "REG" },
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{ &dipswitch, 1, "DPSW" },
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{ 0 }
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};
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static void Sync(void) {
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switch ((regs[1] >> 4) & 3) {
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case 0:
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case 1:
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/* UNROM */
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setprg16(0x8000, regs[1]);
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setprg16(0xC000, regs[1] | 7);
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break;
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case 2:
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/* Maybe unused, NROM-256? */
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setprg32(0x8000, regs[1] >> 1);
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break;
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case 3:
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/* NROM-128 */
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setprg16(0x8000, regs[1]);
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setprg16(0xC000, regs[1]);
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break;
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}
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setchr8(regs[0]);
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setmirror(((regs[0] & 0x20) >> 5) ^ 1);
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}
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static DECLFR(M390Read) {
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uint8 ret = CartBR(A);
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if ((regs[1] & 0x30) == 0x10)
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ret |= dipswitch;
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return ret;
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}
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static DECLFW(M390Write) {
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regs[(A >> 14) & 1] = A & 0x3F;
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Sync();
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}
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static void M390Power(void) {
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regs[0] = 0;
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regs[1] = 0;
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dipswitch = 11; /* hard-coded 150-in-1 menu */
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Sync();
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SetReadHandler(0x8000, 0xffff, M390Read);
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SetWriteHandler(0x8000, 0xffff, M390Write);
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}
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static void M390Reset(void) {
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dipswitch = 11; /* hard-coded 150-in-1 menu */
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Sync();
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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 Mapper390_Init(CartInfo *info) {
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info->Reset = M390Reset;
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info->Power = M390Power;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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