102 lines
2.5 KiB
C
102 lines
2.5 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) 2023
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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_mmc3.h"
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#include "asic_vrc2and4.h"
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static uint8 reg;
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static uint8 init; /* Games switch between ASICs expecting registers to keep their value, so initialize each ASIC only on the first switch and use this bitfield to track it */
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static void applyMode (uint8);
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static SFORMAT StateRegs[] = {
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{ ®, 1, "MODE" },
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{ &init, 1, "INIT" },
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{ 0 },
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};
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static void sync (void) {
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if (reg &0x02) {
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MMC3_syncPRG(0x3F, 0x00);
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MMC3_syncCHR(0x1FF, 0x00);
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MMC3_syncMirror();
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} else {
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VRC24_syncPRG(0x3F, 0x00);
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VRC24_syncCHR(0x1FF, 0x00);
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VRC24_syncMirror();
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}
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}
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int getCHRBank_MMC3 (uint8 bank) {
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return MMC3_getCHRBank(bank) | reg <<(~bank &4? 5: ~bank &2? 3: 1) &0x100;
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}
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int getCHRBank_VRC2 (uint8 bank) {
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return VRC24_getCHRBank(bank) | reg <<(~bank &4? 5: ~bank &2? 3: 1) &0x100;
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}
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static DECLFW (writeReg) {
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uint8 previousReg = reg;
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reg = V;
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if ((previousReg ^V) &2)
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applyMode(1);
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else
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sync();
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}
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static void applyMode (uint8 clear) {
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PPU_hook = NULL;
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MapIRQHook = NULL;
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GameHBIRQHook = NULL;
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if (reg &0x02) {
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MMC3_activate(clear && init &1, sync, MMC3_TYPE_AX5202P, NULL, getCHRBank_MMC3, NULL, NULL);
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init &= ~1;
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} else {
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VRC2_activate(clear && init &2, sync, 0x01, 0x02, NULL, getCHRBank_VRC2, NULL, NULL);
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init &= ~2;
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}
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SetWriteHandler(0xA131, 0xA131, writeReg);
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}
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static void reset (void) {
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reg = 0;
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init = 3;
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applyMode(1);
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}
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static void power (void) {
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reg = 0;
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init = 3;
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applyMode(1);
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}
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static void restore (int version) {
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applyMode(0);
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}
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void UNLSL1632_Init (CartInfo *info) {
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MMC3_addExState();
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VRC24_addExState();
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info->Reset = reset;
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info->Power = power;
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GameStateRestore = restore;
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AddExState(StateRegs, ~0, 0, 0);
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}
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