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Revise mapper 455.

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This commit is contained in:
NewRisingSun
2025-09-12 14:05:59 +02:00
parent 2731fdc56b
commit 7e774f4f5a
1 changed files with 37 additions and 42 deletions
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79
src/boards/455.c
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@@ -1,7 +1,7 @@
/* FCEUmm - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2022
* Copyright (C) 2020
*
* 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
@@ -16,62 +16,57 @@
* 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
*
*
*/
/* N625836 PCB */
#include "mapinc.h"
#include "mmc3.h"
#include "asic_mmc3.h"
static void Mapper455_PRGWrap(uint32 A, uint8 V) {
int prgAND =EXPREGS[1] &0x01? 0x1F: 0x0F;
int prgOR =EXPREGS[0] >>2 &0x07 | EXPREGS[1] <<1 &0x08 | EXPREGS[0] >>2 &0x10;
if (EXPREGS[0] &0x01) {
if (EXPREGS[0] &0x02) {
setprg32(0x8000, prgOR >>1);
} else {
setprg16(0x8000, prgOR);
setprg16(0xC000, prgOR);
static uint8 reg[2];
static void sync () {
if (reg[0] &0x01) {
if (reg[0] &0x02)
setprg32(0x8000, reg[0] >>3);
else {
setprg16(0x8000, reg[0] >>2);
setprg16(0xC000, reg[0] >>2);
}
MMC3_syncCHR(0xFF, 0x00);
} else {
prgOR <<=1;
setprg8(A, V &prgAND | prgOR &~prgAND);
int prgAND = 0x1F;
int chrAND = reg[1] &0x02? 0x7F: 0xFF;
int prgOR = reg[0] >>1;
int chrOR = reg[1] <<6;
MMC3_syncPRG(prgAND, prgOR &~prgAND);
MMC3_syncCHR(chrAND, chrOR &~chrAND);
}
MMC3_syncMirror();
}
static void Mapper455_CHRWrap(uint32 A, uint8 V) {
int chrAND =EXPREGS[1] &0x02? 0xFF: 0x7F;
int chrOR =(EXPREGS[0] >>2 &0x07 | EXPREGS[1] <<1 &0x08 | EXPREGS[0] >>2 &0x10) <<4;
setchr1(A, V &chrAND | chrOR &~chrAND);
}
static DECLFW(Mapper455_Write) {
static DECLFW (writeReg) {
if (A &0x100) {
EXPREGS[0] =V;
EXPREGS[1] =A &0xFF;
FixMMC3PRG(MMC3_cmd);
FixMMC3CHR(MMC3_cmd);
reg[0] = V;
reg[1] = A &0xFF;
sync();
}
}
static void Mapper455_Reset(void) {
EXPREGS[0] =1;
EXPREGS[1] =0;
MMC3RegReset();
static void reset () {
reg[0] = reg[1] = 0;
MMC3_clear();
}
static void Mapper455_Power(void) {
EXPREGS[0] =1;
EXPREGS[1] =0;
GenMMC3Power();
SetWriteHandler(0x4100, 0x5FFF, Mapper455_Write);
static void power () {
reg[0] = reg[1] = 0;
MMC3_power();
SetWriteHandler(0x4020, 0x5FFF, writeReg);
}
void Mapper455_Init(CartInfo *info) {
GenMMC3_Init(info, 256, 256, 0, 0);
cwrap = Mapper455_CHRWrap;
pwrap = Mapper455_PRGWrap;
info->Power = Mapper455_Power;
info->Reset = Mapper455_Reset;
AddExState(EXPREGS, 2, 0, "EXPR");
void Mapper455_Init (CartInfo *info) {
MMC3_init(info, sync, MMC3_TYPE_AX5202P, NULL, NULL, NULL, NULL);
info->Power = power;
info->Reset = reset;
AddExState(reg, 2, 0, "EXPR");
}