/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
- * Copyright (C) 2002 Ben Parnell
+ * Copyright (C) 2002 Xodnizel
*
* 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
#include "mapinc.h"
+static void FP_FASTAPASS(1) Mapper50IRQ(int a)
+{
+ if(IRQa)
+ {
+ if(IRQCount<4096)
+ IRQCount+=a;
+ else
+ {
+ IRQa=0;
+ X6502_IRQBegin(FCEU_IQEXT);
+ }
+ }
+}
-DECLFW(Mapper112_write)
+static void M50Restore(int version)
{
-switch(A)
+ setprg8(0xc000,mapbyte1[0]);
+}
+
+static DECLFW(M50W)
{
- case 0xe000:MIRROR_SET(V&1);break;
- case 0x8000:mapbyte1[0]=V;break;
- case 0xa000:switch(mapbyte1[0])
- {
- case 0:ROM_BANK8(0x8000,V);break;
- case 1:ROM_BANK8(0xA000,V);break;
- case 2: V&=0xFE;VROM_BANK1(0,V);
- VROM_BANK1(0x400,(V+1));break;
- case 3: V&=0xFE;VROM_BANK1(0x800,V);
- VROM_BANK1(0xC00,(V+1));break;
- case 4:VROM_BANK1(0x1000,V);break;
- case 5:VROM_BANK1(0x1400,V);break;
- case 6:VROM_BANK1(0x1800,V);break;
- case 7:VROM_BANK1(0x1c00,V);break;
- }
- X6502_Rebase();
- break;
+ if((A&0xD060)==0x4020)
+ {
+ if(A&0x100)
+ {
+ IRQa=V&1;
+ if(!IRQa) IRQCount=0;
+ X6502_IRQEnd(FCEU_IQEXT);
+ }
+ else
+ {
+ V=((V&1)<<2)|((V&2)>>1)|((V&4)>>1)|(V&8);
+ mapbyte1[0]=V;
+ setprg8(0xc000,V);
+ }
}
}
-void Mapper112_init(void)
+void Mapper50_init(void)
{
- SetWriteHandler(0x8000,0xffff,Mapper112_write);
+ SetWriteHandler(0x4020,0x5fff,M50W);
+ SetReadHandler(0x6000,0xffff,CartBR);
+ MapStateRestore=M50Restore;
+ MapIRQHook=Mapper50IRQ;
+
+ setprg8(0x6000,0xF);
+ setprg8(0x8000,0x8);
+ setprg8(0xa000,0x9);
+ setprg8(0xc000,0x0);
+ setprg8(0xe000,0xB);
}