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Viewing changes to fceu/src/mappers/27.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Fabrice Coutadeur
  • Date: 2009-12-14 08:05:17 UTC
  • Revision ID: james.westby@ubuntu.com-20091214080517-abi5tj8avthfan7c
Tags: upstream-2.1.2+repack
Import upstream version 2.1.2+repack

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fceu/src/mappers/27.cpp
 
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#include "mapinc.h"
 
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static uint32 regchr[9];
 
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static DECLFW(Mapper27_write)
 
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{
 
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 int regnum;
 
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 A&=0xF00F;
 
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 if((A>=0xB000) && (A<=0xE003)) {
 
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    regnum=((((A>>12)+1)&0x03)<<1)|((A&0x02)>>1);
 
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    if(A&1)
 
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       regchr[regnum]=(regchr[regnum]&0x00F)|(V<<4);
 
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    else
 
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       regchr[regnum]=(regchr[regnum]&0x1F0)|(V&0xF);
 
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    VROM_BANK1(regnum<<10,regchr[regnum]);
 
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 }
 
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 switch(A)
 
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 {
 
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  case 0x8000: ROM_BANK8(0x8000|((regchr[8]&2)<<13),V); break;
 
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  case 0xA000: ROM_BANK8(0xa000,V); break;
 
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  case 0x9000: switch(V&3){
 
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                  case 0:setmirror(MI_V);break;
 
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                  case 1:setmirror(MI_H);break;
 
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                  case 2:setmirror(MI_0);break;
 
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                  case 3:setmirror(MI_1);break;
 
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               }
 
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  case 0x9002: regchr[8]=V; break;
 
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  case 0xF000: //X6502_IRQEnd(FCEU_IQEXT);
 
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               IRQLatch=(IRQLatch&0xF0)|(V&0x0F);
 
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                           break;
 
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  case 0xF001: //X6502_IRQEnd(FCEU_IQEXT);
 
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               IRQLatch=(IRQLatch&0x0F)|((V&0xF)<<4);
 
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                           break;
 
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  case 0xF003: IRQa=((IRQa&0x1)<<1)|(IRQa&0x1);
 
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                           X6502_IRQEnd(FCEU_IQEXT);
 
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               break;
 
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  case 0xF002: IRQa=V&3;
 
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                           if(IRQa&0x02) IRQCount=IRQLatch-1;
 
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//                           X6502_IRQEnd(FCEU_IQEXT);
 
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                           break;
 
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 }
 
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// if((A&0xF000)==0xF000) FCEU_printf("$%04x:$%02x, %d\n",A,V, scanline);
 
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}
 
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static void Mapper27_hb(void)
 
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{
 
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//   FCEU_printf("%02x-%d,%d,%d\n",scanline,IRQa,IRQCount,IRQLatch);
 
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        if(IRQa&0x2){
 
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           if(IRQCount==0xFF){
 
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             X6502_IRQBegin(FCEU_IQEXT);
 
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              IRQCount=IRQLatch+1;
 
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         } else {
 
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           IRQCount++;
 
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           }
 
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        }
 
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}
 
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void Mapper27_init(void)
 
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{
 
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  int i;
 
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  for (i=0; i<9; i++) {
 
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    regchr[i]=0;
 
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  }
 
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  IRQa=0;
 
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  IRQCount=IRQLatch=0;
 
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  SetWriteHandler(0x8000,0xffff,Mapper27_write);
 
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  GameHBIRQHook=Mapper27_hb;
 
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}
 
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