Add UNIF boards...

- Add UNL-TH2131-1, UNL-LH51, BMC-RESETNROM-XIN1, BMC-RESET-TXROM
- Add FARID_SLROM_8-IN-1, BMC-830425C-4391T, BMC-TJ-03, BMC-CTC-09
- Add BMC-K-3046, BMC-SA005-A, BMC-K-3006, BMC-K-3036, MINDKIDS
- Add UNL-KS7021A, KS106C, BTL-900218
- Cleanup VRC2and4 (unify power function)

src/boards/resettxrom.c

@@ -0,0 +1,57 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2019 Libretro Team
+ *
+ * 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 313 is used for MMC3-based multicarts that switch
+ * between 128 KiB PRG-ROM/128 KiB CHR-ROM-sized games on each reset and
+ * thus require no additional registers.
+ * Its UNIF board name is BMC-RESET-TXROM.
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static void M313CW(uint32 A, uint8 V) {
+	setchr1r(EXPREGS[0], A, V & 0x7F);
+}
+
+static void M313PW(uint32 A, uint8 V) {
+	setprg8r(EXPREGS[0], A, V & 0x0F);
+}
+
+static void M313Reset(void) {
+	EXPREGS[0]++;
+	EXPREGS[0] &= 0x03;
+	MMC3RegReset();
+}
+
+static void M313Power(void) {
+	EXPREGS[0] = 0;
+	GenMMC3Power();
+}
+
+/* NES 2.0 313, UNIF BMC-RESET-TXROM */
+void BMCRESETTXROM_Init(CartInfo *info) {
+	GenMMC3_Init(info, 512, 256, 0, 0);
+	cwrap = M313CW;
+	pwrap = M313PW;
+	info->Power = M313Power;
+	info->Reset = M313Reset;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}