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/bmc830425C4391t.c

@@ -0,0 +1,101 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * 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 320 is used for the Super HiK 6-in-1 A-030 multicart.
+ * Basically UxROM with an address-latch-based outer bank register.
+ * UNIF board name is BMC-830425C-4391T. Mirroring is hard-wired.
+ * http://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_320
+ */
+
+#include "mapinc.h"
+
+static uint8 regs[2];
+static uint8 isMermaid = 0;
+
+static SFORMAT StateRegs[] =
+{
+	{ regs, 2, "REGS" },
+	{ &isMermaid, 1, "MERM" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	uint8 bank_size = (regs[0] & 0x80) ? 0x07: 0x0F;
+	uint8 outer_bank = !isMermaid ? (regs[0] & 0x78) : 0x04;
+	uint8 inner_bank = regs[1];
+	uint8 game_block = regs[0] & 0x78;
+
+	/* TODO: Hacky and forced mapping of outer banks(game block)... */
+	if (!isMermaid) {
+		switch(game_block) {
+		case 0x00: /* botb outerbank=0 */
+		case 0x10: /* rocketeer outerbank=1  */
+		case 0x20: /* contra outerbank=2  */
+		case 0x28: /* ducktales outerbank=3 */
+		case 0x38: /* school fight outerbank=5 */
+			outer_bank = (game_block >> 4) + ((game_block & 0x08) ? 0x01 : 0x00);
+			outer_bank |= (game_block >> 3) & 1;
+			break;
+		case 0x30:
+			/* Mermaid game block is tricky (to me at least). Aim here is
+			 * when this register is selected, ignore any other outer bank reg changes */
+			isMermaid = 1;
+			outer_bank = 0x04;
+			break;
+		}
+	}
+
+	setprg16r(outer_bank, 0x8000, (inner_bank & bank_size));
+	setprg16r(outer_bank, 0xC000, bank_size);
+	setchr8(0);
+}
+
+static DECLFW(M320Write) {
+	if ((A & 0xF0E0) == 0xF0E0) {
+		regs[0] = (A & 0x1F) << 3;
+	}
+	regs[1] = V & 0x0F;
+	Sync();
+}
+
+static void M320Power(void) {
+	regs[0] = regs[1] = 0;
+	isMermaid = 0;
+	Sync();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0xFFFF, M320Write);
+}
+
+static void M320Reset(void) {
+	regs[0] = regs[1] = 0;
+	isMermaid = 0;
+	Sync();
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void BMC830425C4391T_Init(CartInfo *info) {
+	info->Power = M320Power;
+	info->Reset = M320Reset;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}