Add mapper 174

src/boards/latch.c

@@ -0,0 +1,98 @@
+/* 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 "latch.h"
+
+static uint8 bus_conflict;
+static uint8 *WRAM = NULL;
+static uint32 WRAMSIZE;
+static void (*WSync)(void);
+static readfunc defread;
+
+LATCH latch;
+
+DECLFW(LatchWrite) {
+	/*	FCEU_printf("bs %04x %02x\n",A,V); */
+	if (bus_conflict)
+		V &= CartBR(A);
+    latch.addr = A;
+    latch.data = V;
+	WSync();
+}
+
+void LatchHardReset() {
+	latch.addr = 0;
+	latch.data = 0;
+	WSync();
+}
+
+void LatchPower(void) {
+	LatchHardReset();
+	WSync();
+	if (WRAM) {
+		SetReadHandler(0x6000, 0xFFFF, CartBR);
+		SetWriteHandler(0x6000, 0x7FFF, CartBW);
+		FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
+	} else {
+		SetReadHandler(0x8000, 0xFFFF, defread);
+	}
+	SetWriteHandler(0x8000, 0xFFFF, LatchWrite);
+}
+
+void LatchClose(void) {
+	if (WRAM)
+		FCEU_gfree(WRAM);
+	WRAM = NULL;
+}
+
+static void LatchReset(void) {
+	WSync();
+}
+
+static void StateRestore(int version) {
+	WSync();
+}
+
+void Latch_Init(CartInfo *info, void (*proc)(void), readfunc func,
+    uint8 wram, uint8 busc) {
+	bus_conflict = busc;
+	WSync        = proc;
+	if (func != NULL)
+		defread = func;
+	else
+		defread = CartBROB;
+	info->Power = LatchPower;
+	info->Close = LatchClose;
+	info->Reset = LatchReset;
+	GameStateRestore = StateRestore;
+	if (wram) {
+		WRAMSIZE = 8192;
+		WRAM     = (uint8 *)FCEU_gmalloc(WRAMSIZE);
+		SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
+		if (info->battery) {
+			info->SaveGame[0]    = WRAM;
+			info->SaveGameLen[0] = WRAMSIZE;
+		}
+		AddExState(WRAM, WRAMSIZE, 0, "WRAM");
+	}
+	AddExState(&latch.addr, 2, 0, "ADDR");
+	AddExState(&latch.data, 1, 0, "DATA");
+}