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