mirror of
https://github.com/dborth/fceugx.git
synced 2024-11-05 00:45:06 +01:00
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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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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A&=0xF00F;
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int regnum;
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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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