Add mapper 406, together with generic self-flashing code.

src/boards/406.c

@@ -0,0 +1,55 @@
+/* FCEUmm - 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 "mmc3.h"
+#include "flashrom.h"
+
+uint8 submapper;
+
+static DECLFW(Write) {
+	flashrom_write(A &0x1FFF | (Page[A >>11] +A -PRGptr[0]) &~0x1FFF, V);
+
+	if (submapper ==1)
+		A =A <0xA000 || A >=0xE000? (A ^0x6000): A;
+	else
+		A =A &0xE000 | A >>1 &0x0001;
+	
+	if (A &0x4000)
+		MMC3_IRQWrite(A, V);
+	else
+		MMC3_CMDWrite(A, V);
+}
+
+static void Power(void) {
+	GenMMC3Power();
+	SetReadHandler(0x8000, 0xFFFF, flashrom_read);
+	SetWriteHandler(0x8000, 0xFFFF, Write);
+}
+
+void Mapper406_Init(CartInfo *info) {
+	submapper =info->submapper;
+	GenMMC3_Init(info, 512, 256, 0, 0);
+	flashrom_init (submapper ==1? 0x01: 0xC2, 0xA4, 65536, 0x5555, 0x2AAA, 0x7FFF); /* Macronix MX29F040 (0)/AMD AM29F040 (1) */
+	info->Power =Power;
+	info->SaveGame[0] =PRGptr[0];
+	info->SaveGameLen[0] =PRGsize[0];
+	MapIRQHook =flashrom_cpuCycle;
+}

src/boards/flashrom.c

@@ -0,0 +1,60 @@
+#include "flashrom.h"
+void flashrom_init (uint8 manufacturerID, uint8 modelID, uint32 sectorSize, uint32 magicAddr1, uint32 magicAddr2, uint32 magicMask) {
+	flashrom_manufacturerID =manufacturerID;
+	flashrom_modelID =modelID;
+	flashrom_sectorSize =sectorSize;
+	flashrom_magicAddr1 =magicAddr1;
+	flashrom_magicAddr2 =magicAddr2;
+	flashrom_magicMask =magicMask;
+}
+
+uint8 flashrom_read (uint32 A) {
+	if (flashrom_state ==0x90) /* software ID */
+		return A &1? flashrom_modelID: flashrom_manufacturerID;
+	else
+	if (flashrom_timeOut)
+		return (CartBR(A) ^(flashrom_timeOut &1? 0x40: 0x00)) &~0x88;
+	else
+		return CartBR(A);
+}
+
+void flashrom_write (uint32 fullAddress, uint8 V) {
+	uint32 i;
+	uint8* sector =NULL;
+	uint32 compare =fullAddress &flashrom_magicMask;
+	fullAddress &=PRGsize[0] -1;
+	switch (flashrom_state) {
+		/* command start */
+		default:   if (compare ==flashrom_magicAddr1 && V ==0xAA) flashrom_state++; break;
+		case 0x01: if (compare ==flashrom_magicAddr2 && V ==0x55) flashrom_state++; break;
+		case 0x02: if (compare ==flashrom_magicAddr1) flashrom_state =V; break;
+		/* sector or chip erase */
+		case 0x80: if (compare ==flashrom_magicAddr1 && V ==0xAA) flashrom_state++; break;
+		case 0x81: if (compare ==flashrom_magicAddr2 && V ==0x55) flashrom_state++; break;
+		case 0x82: if (V ==0x30) { /* sector erase */
+				/* Determine the actual sector start by masking with the sector size */
+				fullAddress &=~(flashrom_sectorSize -1);
+				sector =PRGptr[0] +fullAddress;
+				for (i =0; i <flashrom_sectorSize; i++) sector[i] =0xFF;
+				flashrom_timeOut =flashrom_sectorSize;
+			   } else
+			   if (V ==0x10 && compare ==flashrom_magicAddr1) { /* chip erase */
+				for (i =0; i<=PRGsize[0]; i++) PRGptr[0][i] =0xFF;
+				flashrom_timeOut =PRGsize[0];
+			   } else
+			   if (V ==0xF0) flashrom_state =0;
+			   break;
+		/* software ID */
+		case 0x90: if (V ==0xF0) flashrom_state =0; break;
+		/* byte program */
+		case 0xA0: PRGptr[0][fullAddress] =V;
+			   flashrom_state =0;
+			   break;
+	}
+}
+
+void FP_FASTAPASS(1) flashrom_cpuCycle(int a) {
+	while (a--) {
+		if (flashrom_timeOut && !--flashrom_timeOut) flashrom_state =0;
+	}
+}

src/boards/flashrom.h

@@ -0,0 +1,19 @@
+#ifndef _FLASHROM_H
+#define _FLASHROM_H
+#include "mapinc.h"
+
+uint8		flashrom_manufacturerID;
+uint8		flashrom_modelID;
+int		flashrom_state;
+uint32		flashrom_sectorSize;
+int             flashrom_timeOut;
+uint32		flashrom_magicAddr1;
+uint32		flashrom_magicAddr2;
+uint32		flashrom_magicMask;
+
+void            flashrom_init (uint8, uint8, uint32, uint32, uint32, uint32);
+uint8		flashrom_read (uint32);
+void		flashrom_write (uint32, uint8);
+void FP_FASTAPASS(1) flashrom_cpuCycle(int);
+
+#endif

src/ines.c

@@ -840,6 +840,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "831019C J-2282",           402, J2282_Init             )
 	INES_BOARD( "89433",                    403, Mapper403_Init         )
 	INES_BOARD( "JY012005",                 404, Mapper404_Init         )
+	INES_BOARD( "Impact Soft",              406, Mapper406_Init         )
 	INES_BOARD( "retroUSB DPCMcart",        409, Mapper409_Init         )
 	INES_BOARD( "JY-302",                   410, Mapper410_Init         )
 	INES_BOARD( "A88S-1",                   411, Mapper411_Init         )

src/ines.h

@@ -319,6 +319,7 @@ void Mapper399_Init(CartInfo *);
 void Mapper401_Init(CartInfo *);
 void Mapper403_Init(CartInfo *);
 void Mapper404_Init(CartInfo *);
+void Mapper406_Init(CartInfo *);
 void Mapper409_Init(CartInfo *);
 void Mapper410_Init(CartInfo *);
 void Mapper411_Init(CartInfo *);