Add 42-in-80000 multicart (m380)

2020-03-24 01:34:03 +08:00
parent a09293bcc0
commit a9f679ef15
4 changed files with 100 additions and 1 deletions
--- a/src/boards/380.c
+++ b/src/boards/380.c
@@ -0,0 +1,96 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ * Copyright (C) 2020 negativeExponent
+ *
+ * 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 380 denotes the 970630C circuit board,
+ * used on a 512 KiB multicart having 42 to 80,000 listed NROM and UNROM games. */
+
+#include "mapinc.h"
+
+static uint16 latche;
+static uint8 dipswitch;
+
+static SFORMAT StateRegs[] = {
+   { &latche, 2 | FCEUSTATE_RLSB, "LATC" },
+   { &dipswitch, 1, "DPSW" },
+   { 0 }
+};
+
+static void Sync(void)
+{
+   if (latche & 0x200)
+   {
+      if (latche & 1) /* NROM 128 */
+      {
+         setprg16(0x8000, latche >> 2);
+         setprg16(0xC000, latche >> 2);
+      }
+      else /* NROM-256 */
+         setprg32(0x8000, latche >> 3);
+   }
+   else /* UxROM */
+   {
+      setprg16(0x8000, latche >> 2);
+      setprg16(0xC000, (latche >> 2) | 7);
+   }
+   setmirror(((latche >> 1) & 1) ^ 1);
+}
+
+static DECLFR(M380Read)
+{
+   if (latche & 0x100)
+      return dipswitch;
+   return CartBR(A);
+}
+
+static DECLFW(M380Write)
+{
+   latche = A;
+   Sync();
+}
+
+static void M380Reset(void)
+{
+   dipswitch = (dipswitch + 1) & 0xF;
+   latche = 0;
+   Sync();
+}
+
+static void M380Power(void)
+{
+   dipswitch = 0;
+   latche = 0;
+   Sync();
+   setchr8(0);
+   SetReadHandler(0x8000, 0xFFFF, M380Read);
+   SetWriteHandler(0x8000, 0xFFFF, M380Write);
+}
+
+static void StateRestore(int version)
+{
+   Sync();
+}
+
+void Mapper380_Init(CartInfo *info)
+{
+   info->Power = M380Power;
+   info->Reset = M380Reset;
+   GameStateRestore = StateRestore;
+   AddExState(&StateRegs, ~0, 0, 0);
+}