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Mappers 252/253: rewrite to use modular VRC2/4.

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NewRisingSun
2025-04-10 19:16:27 +02:00
committed by LibretroAdmin
parent 98d567bae1
commit 5d398fbb5d
3 changed files with 103 additions and 287 deletions
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103
src/boards/252_253.c Normal file
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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2025 NewRisingSun
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "mapinc.h"
#include "vrc2and4.h"
static uint8 *CHRRAM;
static uint32 CHRRAMSize;
static uint8 mask;
static uint8 compare;
extern uint32 RefreshAddr;
writefunc writePPU;
static SFORMAT stateRegs[] ={
{ &mask, 1, "CHRM" },
{ &compare, 1, "CHRC" },
{ 0 }
};
static void sync () {
int bank;
VRC24_syncWRAM(0);
VRC24_syncPRG(0x01F, 0x000);
for (bank =0; bank <8; bank++) setchr1r((VRC24_chr[bank] &mask) ==compare? 0x10: 0x00, bank <<10, VRC24_chr[bank]);
VRC24_syncMirror();
}
static DECLFW(Mapper252_253_interceptPPUWrite) {
if (~RefreshAddr &0x2000) {
int bank =VRC24_chr[RefreshAddr >>10 &7];
switch(bank) {
case 0x88: mask =0xFC; compare =0x4C; VRC24_Sync(); break;
case 0xC2: mask =0xFE; compare =0x7C; VRC24_Sync(); break;
case 0xC8: mask =0xFE; compare =0x04; VRC24_Sync(); break;
}
}
writePPU(A, V);
}
void Mapper252_power (void) {
mask =0xFE;
compare =0x06;
VRC24_power();
writePPU =GetWriteHandler(0x2007);
SetWriteHandler(0x2007, 0x2007, Mapper252_253_interceptPPUWrite);
}
void Mapper253_power (void) {
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 */
compare =0x04;
VRC24_power();
writePPU =GetWriteHandler(0x2007);
SetWriteHandler(0x2007, 0x2007, Mapper252_253_interceptPPUWrite);
}
void Mapper252_253_close(void) {
if (CHRRAM) {
FCEU_gfree(CHRRAM);
CHRRAM =NULL;
}
}
void Mapper252_Init (CartInfo *info) {
VRC24_init(info, sync, 0x4, 0x8, 1, 1, 0);
info->Power =Mapper252_power;
info->Close =Mapper252_253_close;
AddExState(stateRegs, ~0, 0, 0);
CHRRAMSize =info->iNES2? (info->CHRRamSize +info->CHRRamSaveSize): 2048;
CHRRAM =(uint8*)FCEU_gmalloc(CHRRAMSize);
AddExState(CHRRAM, CHRRAMSize, 0, "CRAM");
SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSize, 1);
}
void Mapper253_Init (CartInfo *info) {
VRC24_init(info, sync, 0x4, 0x8, 1, 1, 0);
info->Power =Mapper253_power;
info->Close =Mapper252_253_close;
AddExState(stateRegs, ~0, 0, 0);
CHRRAMSize =info->iNES2? (info->CHRRamSize +info->CHRRamSaveSize): 2048;
CHRRAM =(uint8*)FCEU_gmalloc(CHRRAMSize);
AddExState(CHRRAM, CHRRAMSize, 0, "CRAM");
SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSize, 1);
}