f9fb33d8e8
- Silence warning [-Wmaybe-uninitialized] - m359: Fix value overflow - m534: Silence warnings - mmc1: Silence warnings - Silence more warnings
113 lines
2.7 KiB
C
113 lines
2.7 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 inner_bank, outer_bank, mode;
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static SFORMAT StateRegs[] =
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{
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{ &inner_bank, 1, "INB0" },
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{ &outer_bank, 1, "OUTB" },
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{ &mode, 1, "MODE" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 bbank = (mode & 4) ? 0 : (inner_bank & 7);
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uint8 bank = outer_bank | bbank;
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uint8 preg[2];
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/* 0: NROM-128: Same inner/outer 16 KiB bank at CPU $8000-$BFFF
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* and $C000-$FFFF
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* 1: NROM-256: 32 kiB bank at CPU $8000-$FFFF (Selected inner/outer bank SHR 1)
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* 2: UNROM: Inner/outer bank at CPU $8000-BFFF,
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* fixed inner bank 7 within outer bank at $C000-$FFFF
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* 3: Unknown
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*
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* The combined inner/outer bank is simply the inner bank, selected by the
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* latch at $8000-$FFFF (or 0 if the latch is disabled) ORed with the
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* outer bank selected by $6001, without any bit shifting.
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*/
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preg[0] = bank;
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preg[1] = 0;
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switch (mode & 3) {
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case 0x00:
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case 0x01:
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preg[1] = bank | ((mode & 1) ? 1 : 0);
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break;
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case 0x02:
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preg[1] = outer_bank | 7;
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case 0x03:
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break;
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}
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setchr8(0);
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setprg16(0x8000, preg[0]);
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setprg16(0xC000, preg[1]);
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setmirror(((mode & 8) >> 3) ^ 1);
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}
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static DECLFW(Write0) {
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mode = V;
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Sync();
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}
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static DECLFW(Write1) {
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outer_bank = V;
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Sync();
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}
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static DECLFW(Write8) {
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inner_bank = V;
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Sync();
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}
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static void BMC60311CPower(void) {
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inner_bank = outer_bank = mode = 0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x6000, Write0);
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SetWriteHandler(0x6001, 0x6001, Write1);
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SetWriteHandler(0x8000, 0xFFFF, Write8);
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}
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static void BMC60311CReset(void) {
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inner_bank = outer_bank = mode = 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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