Rewrite mappers 162,163,164; add mapper 558. Add EEPROM support to 164.

2021-05-30 01:08:41 +02:00
parent 597175043b
commit 97ffbc5f83
10 changed files with 442 additions and 200 deletions
--- a/src/boards/163.c
+++ b/src/boards/163.c
@@ -0,0 +1,106 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2002 Xodnizel
+ *  Copyright (C) 2005 CaH4e3
+ *  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
+ */
+
+/* Nanjing FC-001 PCB */
+
+#include "mapinc.h"
+#include "../ines.h"
+
+static uint8 reg[4];
+static SFORMAT StateRegs[] =
+{
+        { reg, 4, "REGS" },
+        { 0 }
+};
+
+static void sync()
+{
+   setprg32(0x8000, reg[2] <<4 | reg[0] &0xF | (reg[3] &0x04? 0x00: 0x03));
+   setprg8r(0x10, 0x6000, 0);
+   if (~reg[0] &0x80)
+      setchr8(0);
+}
+
+static void hblank(void) {
+   if (reg[0] &0x80 && scanline <239)
+   {  /* Actual hardware cannot look at the current scanline number, but instead latches PA09 on PA13 rises. This does not seem possible with the current PPU emulation however. */
+      setchr4(0x0000, scanline>=127? 1: 0);
+      setchr4(0x1000, scanline>=127? 1: 0);
+   }
+   else
+      setchr8(0);
+}
+
+static DECLFR(readReg)
+{
+   return ~reg[1] &0x04;
+}
+
+static DECLFW(writeReg)
+{
+   uint8 index = A >>8 &3;
+   
+   /* Swap bits of registers 0-2 again if the "swap bits" bit is set. Exclude register 2 on when PRG-ROM is 1 MiB. */
+   if (reg[3] &0x01 && index <= (ROM_size == 64? 1: 2))
+      V = V &~3 | V >>1 &1 | V <<1 &2;
+   
+   if (A &1)
+   {
+      if (reg[1] &0x01 && ~V &0x01) reg[1] ^=0x04;  // If A0=1, flip feedback bit on falling edges of D0
+   }                                                // If A0=0, write to register
+   else
+      reg[index] = V;
+   sync();
+}
+
+static void power(void)
+{
+   memset(reg, 0, sizeof(reg));
+   sync();
+   SetReadHandler (0x5000, 0x57FF, readReg);
+   SetWriteHandler(0x5000, 0x57FF, writeReg);
+   SetReadHandler (0x6000, 0xFFFF, CartBR);
+   SetWriteHandler(0x6000, 0x7FFF, CartBW);
+}
+
+static void reset()
+{
+   memset(reg, 0, sizeof(reg));
+   sync();
+}
+
+void Mapper163_Init (CartInfo *info)
+{
+   uint32 WRAMSIZE = info->iNES2? (info->PRGRamSize + info->PRGRamSaveSize): 8192;
+   info->Power   = power;
+   info->Reset   = reset;
+   GameHBIRQHook = hblank;
+   AddExState(StateRegs, ~0, 0, 0);
+
+   uint8* WRAM = (uint8*) FCEU_gmalloc(WRAMSIZE);
+   SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
+   FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
+   if (info->battery) {
+      info->SaveGame[0] = WRAM;
+      info->SaveGameLen[0] = WRAMSIZE;
+   }
+}