Mapper 14: use the modularized ASIC cores. Mapper 116: Add multicart variant.

2025-09-06 13:12:15 +02:00
parent b5fff6c80f
commit 399daf7a61
3 changed files with 133 additions and 126 deletions
--- a/src/boards/14.c
+++ b/src/boards/14.c
@@ -0,0 +1,101 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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 "asic_mmc3.h"
+#include "asic_vrc2and4.h"
+
+static uint8 reg;
+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  */
+static void applyMode (uint8);
+
+static SFORMAT StateRegs[] = {
+	{ &reg, 1, "MODE" },
+	{ &init, 1, "INIT" },
+	{ 0 },
+};
+
+static void sync (void) {
+	if (reg &0x02) {
+		MMC3_syncPRG(0x3F, 0x00);
+		MMC3_syncCHR(0x1FF, 0x00);
+		MMC3_syncMirror();
+	} else {
+		VRC24_syncPRG(0x3F, 0x00);
+		VRC24_syncCHR(0x1FF, 0x00);
+		VRC24_syncMirror();
+	}
+}
+
+int getCHRBank_MMC3 (uint8 bank) {
+	return MMC3_getCHRBank(bank) | reg <<(~bank &4? 5: ~bank &2? 3: 1) &0x100;
+}
+
+int getCHRBank_VRC2 (uint8 bank) {
+	return VRC24_getCHRBank(bank) | reg <<(~bank &4? 5: ~bank &2? 3: 1) &0x100;
+}
+
+static DECLFW(writeReg) {
+	uint8 previousReg = reg;
+	reg = V;
+	if ((previousReg ^V) &2)
+		applyMode(1);
+	else
+		sync();
+}
+
+static void applyMode (uint8 clear) {
+	PPU_hook = NULL;
+	MapIRQHook = NULL;
+	GameHBIRQHook = NULL;
+	if (reg &0x02) {
+		MMC3_activate(clear && init &1, sync, MMC3_TYPE_AX5202P, NULL, getCHRBank_MMC3, NULL, NULL);
+		init &= ~1;
+	} else {
+		VRC2_activate(clear && init &2, sync, 0x01, 0x02, NULL, getCHRBank_VRC2, NULL, NULL);
+		init &= ~2;
+	}
+	SetWriteHandler(0xA131, 0xA131, writeReg);
+}
+
+static void reset (void) {
+	reg = 0;
+	init = 3;
+	applyMode(1);
+}
+
+static void power (void) {
+	reg = 0;
+	init = 3;
+	applyMode(1);
+}
+
+static void restore (int version) {
+	applyMode(0);
+}
+
+void UNLSL1632_Init (CartInfo *info) {
+	MMC3_addExState();
+	VRC24_addExState();
+	info->Reset = reset;
+	info->Power = power;
+	GameStateRestore = restore;
+	AddExState(StateRegs, ~0, 0, 0);
+}