104 lines
3.0 KiB
C
104 lines
3.0 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 "vrc2and4.h"
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static uint8 *CHRRAM;
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static uint32 CHRRAMSize;
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static uint8 mask;
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static uint8 compare;
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extern uint32 RefreshAddr;
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static writefunc writePPU;
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static SFORMAT stateRegs[] ={
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{ &mask, 1, "CHRM" },
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{ &compare, 1, "CHRC" },
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{ 0 }
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};
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static void sync () {
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int bank;
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VRC24_syncWRAM(0);
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VRC24_syncPRG(0x01F, 0x000);
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for (bank =0; bank <8; bank++) setchr1r((VRC24_chr[bank] &mask) ==compare? 0x10: 0x00, bank <<10, VRC24_chr[bank]);
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VRC24_syncMirror();
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}
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static DECLFW(Mapper252_253_interceptPPUWrite) {
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if (~RefreshAddr &0x2000) {
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int bank =VRC24_chr[RefreshAddr >>10 &7];
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switch(bank) {
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case 0x88: mask =0xFC; compare =0x4C; VRC24_Sync(); break;
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case 0xC2: mask =0xFE; compare =0x7C; VRC24_Sync(); break;
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case 0xC8: mask =0xFE; compare =0x04; VRC24_Sync(); break;
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}
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}
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writePPU(A, V);
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}
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void Mapper252_power (void) {
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mask =0xFE;
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compare =0x06;
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VRC24_power();
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writePPU =GetWriteHandler(0x2007);
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SetWriteHandler(0x2007, 0x2007, Mapper252_253_interceptPPUWrite);
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}
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void Mapper253_power (void) {
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mask =0xFE; /* There are two board revisions, the earlier one with a non-switchable mask/compare FE/04 and a later switchable one that starts with FC/28 */
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compare =0x04;
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VRC24_power();
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writePPU =GetWriteHandler(0x2007);
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SetWriteHandler(0x2007, 0x2007, Mapper252_253_interceptPPUWrite);
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}
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void Mapper252_253_close(void) {
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if (CHRRAM) {
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FCEU_gfree(CHRRAM);
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CHRRAM =NULL;
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}
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}
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void Mapper252_Init (CartInfo *info) {
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VRC24_init(info, sync, 0x4, 0x8, 1, 1, 0);
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info->Power =Mapper252_power;
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info->Close =Mapper252_253_close;
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AddExState(stateRegs, ~0, 0, 0);
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CHRRAMSize =info->iNES2? (info->CHRRamSize +info->CHRRamSaveSize): 2048;
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CHRRAM =(uint8*)FCEU_gmalloc(CHRRAMSize);
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AddExState(CHRRAM, CHRRAMSize, 0, "CRAM");
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SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSize, 1);
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}
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void Mapper253_Init (CartInfo *info) {
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VRC24_init(info, sync, 0x4, 0x8, 1, 1, 0);
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info->Power =Mapper253_power;
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info->Close =Mapper252_253_close;
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AddExState(stateRegs, ~0, 0, 0);
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CHRRAMSize =info->iNES2? (info->CHRRamSize +info->CHRRamSaveSize): 2048;
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CHRRAM =(uint8*)FCEU_gmalloc(CHRRAMSize);
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AddExState(CHRRAM, CHRRAMSize, 0, "CRAM");
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SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSize, 1);
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}
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