102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
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/* 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 320 is used for the Super HiK 6-in-1 A-030 multicart.
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* Basically UxROM with an address-latch-based outer bank register.
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* UNIF board name is BMC-830425C-4391T. Mirroring is hard-wired.
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* http://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_320
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*/
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#include "mapinc.h"
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static uint8 regs[2];
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static uint8 isMermaid = 0;
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static SFORMAT StateRegs[] =
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{
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{ regs, 2, "REGS" },
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{ &isMermaid, 1, "MERM" },
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{ 0 }
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};
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static void Sync(void) {
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uint8 bank_size = (regs[0] & 0x80) ? 0x07: 0x0F;
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uint8 outer_bank = !isMermaid ? (regs[0] & 0x78) : 0x04;
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uint8 inner_bank = regs[1];
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uint8 game_block = regs[0] & 0x78;
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/* TODO: Hacky and forced mapping of outer banks(game block)... */
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if (!isMermaid) {
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switch(game_block) {
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case 0x00: /* botb outerbank=0 */
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case 0x10: /* rocketeer outerbank=1 */
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case 0x20: /* contra outerbank=2 */
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case 0x28: /* ducktales outerbank=3 */
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case 0x38: /* school fight outerbank=5 */
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outer_bank = (game_block >> 4) + ((game_block & 0x08) ? 0x01 : 0x00);
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outer_bank |= (game_block >> 3) & 1;
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break;
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case 0x30:
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/* Mermaid game block is tricky (to me at least). Aim here is
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* when this register is selected, ignore any other outer bank reg changes */
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isMermaid = 1;
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outer_bank = 0x04;
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break;
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}
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}
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setprg16r(outer_bank, 0x8000, (inner_bank & bank_size));
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setprg16r(outer_bank, 0xC000, bank_size);
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setchr8(0);
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}
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static DECLFW(M320Write) {
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if ((A & 0xF0E0) == 0xF0E0) {
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regs[0] = (A & 0x1F) << 3;
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}
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regs[1] = V & 0x0F;
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Sync();
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}
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static void M320Power(void) {
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regs[0] = regs[1] = 0;
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isMermaid = 0;
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Sync();
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(0x8000, 0xFFFF, M320Write);
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}
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static void M320Reset(void) {
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regs[0] = regs[1] = 0;
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isMermaid = 0;
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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 BMC830425C4391T_Init(CartInfo *info) {
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info->Power = M320Power;
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info->Reset = M320Reset;
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GameStateRestore = StateRestore;
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AddExState(&StateRegs, ~0, 0, 0);
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}
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