Add mapper 563.

src/boards/563.c

@@ -0,0 +1,63 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  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 "vrc2and4.h"
+
+static uint8 irqEnabled;
+static uint8 irqCounter;
+
+static SFORMAT Mapper563_stateRegs[] ={
+	{ &irqEnabled, 1, "IRQE" },
+	{ &irqCounter, 1, "CNTL" },
+	{ 0 }
+};
+
+static void sync () {
+	VRC24_syncPRG(0x01F, 0x000);
+	VRC24_syncCHR(0x1FF, 0x000);
+	VRC24_syncMirror();
+}
+
+DECLFW(Mapper563_writeIRQ) {
+	X6502_IRQEnd(FCEU_IQEXT);
+	switch(A &0x1C) {
+		case 0x0C: irqEnabled =0; break;
+		case 0x08: irqEnabled =1; break;
+		case 0x1C: irqCounter =0; break;
+	}
+}
+
+static void Mapper563_scanline (void) { /* Actually, a sixteen-stage counter triggering on falling PA12. FCEU's PPU emulation isn't accurate enough for that, however, so just raise IRQ every two scanlines. */
+	if (!(++irqCounter &1) && irqEnabled) X6502_IRQBegin(FCEU_IQEXT);
+}
+
+void Mapper563_power(void) {
+	irqEnabled =irqCounter =0;
+	VRC24_power();
+	SetWriteHandler(0xF000, 0xFFFF, Mapper563_writeIRQ);
+}
+
+void Mapper563_Init (CartInfo *info) {
+	VRC24_init(info, sync, 0x01, 0x02, 0, 0, 0);
+	AddExState(Mapper563_stateRegs, ~0, 0, 0);
+	info->Power =Mapper563_power;
+	GameHBIRQHook = Mapper563_scanline;
+}

src/ines.c

@@ -896,6 +896,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "",                         550, Mapper550_Init         )
 	INES_BOARD( "YC-03-09",                 558, Mapper558_Init         )
 	INES_BOARD( "Subor Sango II",           559, Mapper559_Init         )
+	INES_BOARD( "J-2020",                   563, Mapper563_Init         )
 INES_BOARD_END()
 
 static uint32 iNES_get_mapper_id(void)

src/ines.h

@@ -394,5 +394,6 @@ void Mapper555_Init(CartInfo *);
 void Mapper556_Init(CartInfo *);
 void Mapper558_Init(CartInfo *);
 void Mapper559_Init(CartInfo *);
+void Mapper563_Init(CartInfo *);
 
 #endif