70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2025 NewRisingSun
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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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#include "mapinc.h"
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#include "asic_vrc2and4.h"
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#include "cartram.h"
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static void sync () {
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VRC24_syncWRAM(0);
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VRC24_syncPRG(0x03F, 0x000); /* A real VRC4 has a PRG-ROM maximum of 256 KiB, but some hacks use more than that. */
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VRC24_syncCHR(0x1FF, 0x000);
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VRC24_syncMirror();
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if (ROM_size &1) setprg16(0xC000, ROM_size -1); /* A number of Contra hacks have a PRG-ROM size of 400 KiB, expecting the last 16 KiB to be determined via subtraction. They would not work on real hardware. */
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}
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void Mapper21_Init (CartInfo *info) {
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switch(info->submapper) {
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case 1: VRC4_init(info, sync, 0x02, 0x04, 1, NULL, NULL, NULL, NULL, NULL); break;
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case 2: VRC4_init(info, sync, 0x40, 0x80, 1, NULL, NULL, NULL, NULL, NULL); break;
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default: VRC4_init(info, sync, 0x42, 0x84, 1, NULL, NULL, NULL, NULL, NULL); break;
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}
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WRAM_init(info, 8);
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}
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static int Mapper22_getCHRBank(uint8 bank) {
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return VRC24_getCHRBank(bank &7) >>1;
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}
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void Mapper22_Init (CartInfo *info) {
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VRC2_init(info, sync, 0x02, 0x01, NULL, Mapper22_getCHRBank, NULL, NULL);
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WRAM_init(info, 8);
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}
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void Mapper23_Init (CartInfo *info) {
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switch(info->submapper) {
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case 1: VRC4_init(info, sync, 0x01, 0x02, 1, NULL, NULL, NULL, NULL, NULL); break;
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case 2: VRC4_init(info, sync, 0x04, 0x08, 1, NULL, NULL, NULL, NULL, NULL); break;
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case 3: VRC2_init(info, sync, 0x01, 0x02, NULL, NULL, NULL, NULL); break;
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default: VRC4_init(info, sync, 0x05, 0x0A, 1, NULL, NULL, NULL, NULL, NULL); break;
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}
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WRAM_init(info, 8);
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}
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void Mapper25_Init (CartInfo *info) {
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switch(info->submapper) {
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case 1: VRC4_init(info, sync, 0x02, 0x01, 1, NULL, NULL, NULL, NULL, NULL); break;
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case 2: VRC4_init(info, sync, 0x08, 0x04, 1, NULL, NULL, NULL, NULL, NULL); break;
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case 3: VRC2_init(info, sync, 0x02, 0x01, NULL, NULL, NULL, NULL); break;
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default: VRC4_init(info, sync, 0x0A, 0x05, 1, NULL, NULL, NULL, NULL, NULL); break;
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}
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WRAM_init(info, 8);
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}
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