Merge pull request #23 from Molorius/master

[NES] Added support for MMC4 (mapper 10)
OtherCrashOverride · Jul 8, 2018 · 461950a · 461950a
2 parents 1f1edd3 + a49bda6
commit 461950a
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diff --git a/nesemu-go/components/nofrendo/mappers/map010.c b/nesemu-go/components/nofrendo/mappers/map010.c
@@ -0,0 +1,161 @@
+/*
+** Nofrendo (c) 1998-2000 Matthew Conte ([email protected])
+**
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of version 2 of the GNU Library General 
+** Public License as published by the Free Software Foundation.
+**
+** 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 
+** Library General Public License for more details.  To obtain a 
+** copy of the GNU Library General Public License, write to the Free 
+** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+**
+** Any permitted reproduction of these routines, in whole or in part,
+** must bear this legend.
+**
+**
+** map010.c
+**
+** mapper 10 interface
+** $Id: map010.c,v 1.0 2018/07/07
+*/
+
+#include <string.h>
+#include <noftypes.h>
+#include <nes_mmc.h>
+#include <nes_ppu.h>
+#include <libsnss.h>
+
+static uint8 latch[2];
+static uint8 regs[4];
+
+/* Used when tile $FD/$FE is accessed */
+static void mmc10_latchfunc(uint32 address, uint8 value)
+{
+   if (0xFD == value || 0xFE == value)
+   {
+      int reg;
+
+      if (address)
+      {
+         latch[1] = value;
+         reg = 2 + (value - 0xFD);
+      }
+      else
+      {
+         latch[0] = value;
+         reg = value - 0xFD;
+      }
+
+      mmc_bankvrom(4, address, regs[reg]);
+   }
+}
+
+/* mapper 10: MMC4 */
+/* MMC4: Fire Emblem */
+static void map10_write(uint32 address, uint8 value)
+{
+   switch ((address & 0xF000) >> 12)
+   {
+   case 0xA:
+      mmc_bankrom(16, 0x8000, value);
+      break;
+
+   case 0xB:
+      regs[0] = value;
+      if (0xFD == latch[0])
+         mmc_bankvrom(4, 0x0000, value);
+      break;
+
+   case 0xC:
+      regs[1] = value;
+      if (0xFE == latch[0])
+         mmc_bankvrom(4, 0x0000, value);
+      break;
+
+   case 0xD:
+      regs[2] = value;
+      if (0xFD == latch[1])
+         mmc_bankvrom(4, 0x1000, value);
+      break;
+
+   case 0xE:
+      regs[3] = value;
+      if (0xFE == latch[1])
+         mmc_bankvrom(4, 0x1000, value);
+      break;
+
+   case 0xF:
+      if (value & 1)
+         ppu_mirror(0, 0, 1, 1); /* horizontal */
+      else
+         ppu_mirror(0, 1, 0, 1); /* vertical */
+      break;
+
+   default:
+      break;
+   }
+}
+
+static void map10_init(void)
+{
+   memset(regs, 0, sizeof(regs));
+
+   mmc_bankrom(16, 0x8000, 0);
+   mmc_bankrom(16, 0xC000, (mmc_getinfo()->rom_banks) - 1);
+
+   latch[0] = 0xFE;
+   latch[1] = 0xFE;
+
+   ppu_setlatchfunc(mmc10_latchfunc);
+}
+
+static void map10_getstate(SnssMapperBlock *state)
+{
+   state->extraData.mapper10.latch[0] = latch[0];
+   state->extraData.mapper10.latch[1] = latch[1];
+   state->extraData.mapper10.lastB000Write = regs[0];
+   state->extraData.mapper10.lastC000Write = regs[1];
+   state->extraData.mapper10.lastD000Write = regs[2];
+   state->extraData.mapper10.lastE000Write = regs[3];
+}
+
+static void map10_setstate(SnssMapperBlock *state)
+{
+   latch[0] = state->extraData.mapper10.latch[0];
+   latch[1] = state->extraData.mapper10.latch[1];
+   regs[0] = state->extraData.mapper10.lastB000Write;
+   regs[1] = state->extraData.mapper10.lastC000Write;
+   regs[2] = state->extraData.mapper10.lastD000Write;
+   regs[3] = state->extraData.mapper10.lastE000Write;
+}
+
+static map_memwrite map10_memwrite[] =
+{
+   { 0x8000, 0xFFFF, map10_write },
+   {     -1,     -1, NULL }
+};
+
+mapintf_t map10_intf =
+{
+   10, /* mapper number */
+   "MMC4", /* mapper name */
+   map10_init, /* init routine */
+   NULL, /* vblank callback */
+   NULL, /* hblank callback */
+   map10_getstate, /* get state (snss) */
+   map10_setstate, /* set state (snss) */
+   NULL, /* memory read structure */
+   map10_memwrite, /* memory write structure */
+   NULL /* external sound device */
+};
+
+/*
+** $Log: map010.c,v $
+** Revision 1.0  2018/07/07
+** initial revision based on map009.c
+**
+*/
diff --git a/nesemu-go/components/nofrendo/nes/mmclist.c b/nesemu-go/components/nofrendo/nes/mmclist.c
@@ -36,6 +36,7 @@ extern mapintf_t map5_intf;
 extern mapintf_t map7_intf;
 extern mapintf_t map8_intf;
 extern mapintf_t map9_intf;
+extern mapintf_t map10_intf;
 extern mapintf_t map11_intf;
 extern mapintf_t map15_intf;
 extern mapintf_t map16_intf;
@@ -74,6 +75,7 @@ const mapintf_t *mappers[] =
    &map7_intf,
    &map8_intf,
    &map9_intf,
+   &map10_intf,
    &map11_intf,
    &map15_intf,
    &map16_intf,