85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* FCEUmm - NES/Famicom Emulator
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*
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* Copyright (C) 2019 Libretro Team
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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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/* added 2019-5-23
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* UNIF: BMC-60311C:
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* https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_289
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*/
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#include "mapinc.h"
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static uint8 latch, reg[2];
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static SFORMAT StateRegs[] =
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{
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{ &latch, 1, "LATC" },
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{ reg, 2, "REGS" },
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{ 0 }
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};
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static void Sync(void) {
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if (reg[0] &2) { /* UNROM */
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setprg16(0x8000, latch &7 | reg[1] &~7);
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setprg16(0xC000, 7 | reg[1] &~7);
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} else
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if (reg[0] &1) /* NROM-256 */
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setprg32(0x8000, reg[1] >>1);
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else { /* NROM-128 */
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setprg16(0x8000, reg[1]);
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setprg16(0xC000, reg[1]);
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}
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SetupCartCHRMapping(0, CHRptr[0], 0x2000, !(reg[0] &4)); /* CHR-RAM write-protect */
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setchr8(0);
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setmirror(!(reg[0] &8));
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}
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static DECLFW(WriteReg) {
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reg[A &1] =V;
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Sync();
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}
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static DECLFW(WriteLatch) {
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latch = V;
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Sync();
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}
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static void BMC60311CPower(void) {
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latch =reg[0] =reg[1] =0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x6001, WriteReg);
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SetWriteHandler(0x8000, 0xFFFF, WriteLatch);
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}
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static void BMC60311CReset(void) {
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latch =reg[0] =reg[1] =0;
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Sync();
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}
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static void BMC60311CRestore(int version) {
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Sync();
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}
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void BMC60311C_Init(CartInfo *info) {
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info->Power = BMC60311CPower;
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info->Reset = BMC60311CReset;
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GameStateRestore = BMC60311CRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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