Rewrite mapper 355 to actually work, using emulation of the PIC using NES 2.0 Misc. ROM data.

2025-04-11 19:30:14 +02:00
parent 658637a02a
commit 7b16c23f70
6 changed files with 1482 additions and 95 deletions
--- a/src/boards/355.c
+++ b/src/boards/355.c
@@ -0,0 +1,121 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023-2024 negativeExponent
+ *  Copyright (C) 2025 NewRisingSun
+ *
+ * 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 "pic16c5x.h"
+
+static uint32 address;
+static uint8 *picrom = NULL;
+
+static uint8_t pci16c5x_read(int port) {
+	if (port == 0) {
+		return (1 |
+			(address & 0x0040 ? 0x02 : 0) | /*  A6 -> RA1 */
+			(address & 0x0020 ? 0x04 : 0) | /*  A5 -> RA2 */
+			(address & 0x0010 ? 0x08 : 0)); /*  A4 -> RA3 */
+	} else if (port == 1) {
+		return (
+			(address & 0x1000 ? 0x01 : 0) | /* A12 -> RB0 */
+			(address & 0x0080 ? 0x02 : 0) | /*  A7 -> RB1 */
+			(address & 0x0400 ? 0x04 : 0) | /* A10 -> RB2 */
+			(address & 0x0800 ? 0x08 : 0) | /* A11 -> RB3 */
+			(address & 0x0200 ? 0x10 : 0) | /*  A9 -> RB4 */
+			(address & 0x0100 ? 0x20 : 0) | /*  A8 -> RB5 */
+			(address & 0x2000 ? 0x40 : 0) | /* A13 -> RB6 */
+			(address & 0x4000 ? 0x80 : 0)); /* A14 -> RB7 */
+	}
+	return (0xFF);
+}
+
+static void pci16c5x_write(int port, int val) {
+	if (port == 0) {
+		if (val & 0x1001) {
+			X6502_IRQEnd(FCEU_IQEXT);
+		} else {
+			X6502_IRQBegin(FCEU_IQEXT);
+		}
+	}
+}
+
+static void M355CPUIRQHook(int a) {
+	while (a--) {
+		pic16c5x_run();
+	}
+}
+
+static readfunc cpuRead[0x10000];
+static writefunc cpuWrite[0x10000];
+
+static DECLFR(M355Read) {
+	address = A;
+	if (A >= 0x8000) {
+		return CartBR(A);
+	}
+	return cpuRead[A](A);
+}
+
+static DECLFW(M355Write) {
+	address = A;
+	if (cpuWrite[A]) {
+		cpuWrite[A](A, V);
+	}
+}
+
+static void M355Power(void) {
+	int x;
+
+	address = 0;
+
+	pic16c5x_reset(1);
+
+	setprg32(0x8000, 0);
+	setchr8(0);
+
+	for (x = 0; x < 0x10000; x++) {
+		cpuRead[x] = GetReadHandler(x);
+		cpuWrite[x] = GetWriteHandler(x);
+	}
+
+	SetReadHandler(0, 0xFFFF, M355Read);
+	SetWriteHandler(0, 0xFFFF, M355Write);
+}
+
+static void M355Reset(void) {
+	address = 0;
+	pic16c5x_reset(0);
+}
+
+static void M355Close(void) {
+	picrom = NULL;
+}
+
+void UNL3DBlock_Init(CartInfo *info) {
+	if (MiscROM && info->miscROMSize) picrom = MiscROM;
+	if (picrom) {
+		pic16c54_init(picrom, pci16c5x_read, pci16c5x_write);
+		pic16c5x_add_statesinfo();
+	}
+	info->Power = M355Power;
+	info->Reset = M355Reset;
+	info->Close = M355Close;
+	MapIRQHook = M355CPUIRQHook;
+	AddExState(&address, sizeof(address), 0, "ADDR");
+}