Add mappers 448 and 556

src/boards/448.c

@@ -0,0 +1,161 @@
+/* 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
+ */
+
+/* NES 2.0 Mapper 448
+ * VRC4-based 830768C multicart circuit board used by a Super 6-in-1 multicart.
+ */
+
+#include "mapinc.h"
+#include "latch.h"
+
+static uint8 reg;
+static uint8 vrc4Prg;
+static uint8 vrc4Mirr;
+static uint8 vrc4Misc;
+static uint8 vrc4IRQLatch;
+static uint8 vrc4IRQa;
+static uint8 vrc4IRQCount;
+static int16 vrc4IRQCycles;
+
+static SFORMAT StateRegs[] = {
+	{ &reg,           1, "REGS" },
+	{ &vrc4Prg,       1, "PREG" },
+	{ &vrc4Mirr,      1, "V4MI" },
+	{ &vrc4Misc,      1, "V4MS" },
+	{ &vrc4IRQLatch,  1, "VILA" },
+	{ &vrc4IRQa,      1, "VIMO" },
+	{ &vrc4IRQCount,  1, "VICO" },
+	{ &vrc4IRQCycles, 2, "VICY" },
+	{ 0 },
+};
+
+static void Sync(void) {
+	setchr8(0);
+	if (reg & 0x08) { /* AOROM */
+		setprg32(0x8000, ((reg << 2) & ~0x07) | (latch.data & 0x07));
+		setmirror(MI_0 + ((latch.data >> 4) & 0x01));
+	} else {
+		if (reg & 0x04) { /* UOROM */
+			setprg16(0x8000, ((reg << 3) & ~0x0F) | (vrc4Prg & 0x0F));
+			setprg16(0xC000, ((reg << 3) & ~0x0F) | 0x0F);
+		} else { /* UNROM */
+			setprg16(0x8000, (reg << 3) | (vrc4Prg & 0x07));
+			setprg16(0xC000, (reg << 3) | 0x07);
+		}
+		switch (vrc4Mirr & 0x03) {
+		case 0: setmirror(MI_V); break;
+		case 1: setmirror(MI_H); break;
+		case 2: setmirror(MI_0); break;
+		case 3: setmirror(MI_1); break;
+		}
+	}
+}
+
+static DECLFW(writeVRC4) {
+	if (A < 0x9000) {
+		vrc4Prg = V;
+		Sync();
+	} else {
+		switch (A & 0xF000 | ((A >> 2) & 3)) {		
+		case 0x9000:
+			vrc4Mirr = V;
+			Sync();
+			break;
+		case 0x9002:
+			vrc4Misc = V;
+			break;
+		case 0xF000:
+			vrc4IRQLatch = (vrc4IRQLatch & 0xF0) | (V & 0x0F);
+			break;
+		case 0xF001:
+			vrc4IRQLatch = (vrc4IRQLatch & 0x0F) | (V << 4);
+			break;
+		case 0xF002:
+			vrc4IRQa = V;
+			if (vrc4IRQa & 0x02) {
+				vrc4IRQCount = vrc4IRQLatch;
+				vrc4IRQCycles = 341;
+			}
+			X6502_IRQEnd(FCEU_IQEXT);
+			break;
+		case 0xF003:
+			vrc4IRQa = (vrc4IRQa & ~0x02) | ((vrc4IRQa << 1) & 0x02);
+			X6502_IRQEnd(FCEU_IQEXT);
+			break;
+		}
+	}
+}
+
+static DECLFW(M448WriteReg) {
+	if (vrc4Misc & 1) {
+		reg = A & 0xFF;
+		Sync();
+	}
+}
+
+static DECLFW(M448Write) {
+	LatchWrite(A, V);
+    writeVRC4(A, V);
+}
+
+static void FP_FASTAPASS(1) M448CPUHook(int a) {
+	int count = a;
+	while (count--) {
+		if ((vrc4IRQa & 0x02) && ((vrc4IRQa & 0x04) || ((vrc4IRQCycles -= 3) <= 0))) {
+			if (~vrc4IRQa & 0x04) {
+				vrc4IRQCycles += 341;
+			}
+			if (!++vrc4IRQCount) {
+				vrc4IRQCount = vrc4IRQLatch;
+				X6502_IRQBegin(FCEU_IQEXT);
+			}
+		}
+	}
+}
+
+static void M448Reset(void) {
+	reg = 0;
+	Sync();
+}
+
+static void M448Power(void) {
+	reg = 0;
+	vrc4Prg = 0;
+	vrc4Mirr = vrc4Misc = 0;
+	vrc4IRQLatch = vrc4IRQa = vrc4IRQCount = vrc4IRQCycles = 0;
+	LatchPower();
+
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x6000, 0x7FFF, M448WriteReg);
+	SetWriteHandler(0x8000, 0xFFFF, M448Write);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper448_Init(CartInfo *info) {
+	Latch_Init(info, Sync, NULL, 0, 0);
+	info->Reset = M448Reset;
+	info->Power = M448Power;
+	MapIRQHook = M448CPUHook;
+	GameStateRestore = StateRestore;
+	AddExState(StateRegs, ~0, 0, 0);
+}