71 lines
1.9 KiB
C
71 lines
1.9 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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*/
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/* NES 2.0 mapper 339 is used for a 21-in-1 multicart.
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* Its UNIF board name is BMC-K-3006.
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* http://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_339
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*/
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#include "mapinc.h"
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#include "mmc3.h"
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static void BMCK3006CW(uint32 A, uint8 V) {
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setchr1(A, (V & 0x7F) | (EXPREGS[0] & 0x18) << 4);
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}
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static void BMCK3006PW(uint32 A, uint8 V) {
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if (EXPREGS[0] & 0x20) { /* MMC3 mode */
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setprg8(A, (V & 0x0F) | (EXPREGS[0] & 0x18) << 1);
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} else {
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if ((EXPREGS[0] & 0x07) == 0x06) { /* NROM-256 */
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setprg32(0x8000, (EXPREGS[0] >> 1) & 0x0F);
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} else { /* NROM-128 */
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setprg16(0x8000, EXPREGS[0] & 0x1F);
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setprg16(0xC000, EXPREGS[0] & 0x1F);
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}
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}
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}
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static DECLFW(BMCK3006Write) {
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EXPREGS[0] = A & 0x3F;
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FixMMC3PRG(MMC3_cmd);
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FixMMC3CHR(MMC3_cmd);
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}
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static void BMCK3006Reset(void) {
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EXPREGS[0] = 0;
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MMC3RegReset();
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}
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static void BMCK3006Power(void) {
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EXPREGS[0] = 0;
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GenMMC3Power();
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SetWriteHandler(0x6000, 0x7FFF, BMCK3006Write);
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}
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void BMCK3006_Init(CartInfo *info) {
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GenMMC3_Init(info, 512, 512, 8, 0);
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pwrap = BMCK3006PW;
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cwrap = BMCK3006CW;
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info->Power = BMCK3006Power;
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info->Reset = BMCK3006Reset;
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AddExState(EXPREGS, 1, 0, "EXPR");
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}
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