| 1 | #include "mapinc.h" |
| 2 | |
| 3 | static uint32 regchr[9]; |
| 4 | |
| 5 | static DECLFW(Mapper27_write) |
| 6 | { |
| 7 | A&=0xF00F; |
| 8 | int regnum; |
| 9 | if((A>=0xB000) && (A<=0xE003)) { |
| 10 | regnum=((((A>>12)+1)&0x03)<<1)|((A&0x02)>>1); |
| 11 | if(A&1) |
| 12 | regchr[regnum]=(regchr[regnum]&0x0F)|(V<<4); |
| 13 | else |
| 14 | regchr[regnum]=(regchr[regnum]&0xFF0)|(V&0xF); |
| 15 | VROM_BANK1(regnum<<10,regchr[regnum]); |
| 16 | } |
| 17 | switch(A) |
| 18 | { |
| 19 | case 0x8000: if(regchr[8]&2) |
| 20 | ROM_BANK8(0xc000,V); |
| 21 | else |
| 22 | ROM_BANK8(0x8000,V); |
| 23 | break; |
| 24 | case 0xA000: ROM_BANK8(0xa000,V); break; |
| 25 | case 0x9000: |
| 26 | switch(V&3){ |
| 27 | case 0:setmirror(MI_V);break; |
| 28 | case 1:setmirror(MI_H);break; |
| 29 | case 2:setmirror(MI_0);break; |
| 30 | case 3:setmirror(MI_1);break; |
| 31 | } |
| 32 | case 0x9002: regchr[8]=V; break; |
| 33 | case 0xF000: //X6502_IRQEnd(FCEU_IQEXT); |
| 34 | IRQLatch=(IRQLatch&0xF0)|(V&0x0F); |
| 35 | break; |
| 36 | case 0xF001: //X6502_IRQEnd(FCEU_IQEXT); |
| 37 | IRQLatch=(IRQLatch&0x0F)|((V&0xF)<<4); |
| 38 | break; |
| 39 | case 0xF003: IRQa=((IRQa&0x1)<<1)|(IRQa&0x1); |
| 40 | X6502_IRQEnd(FCEU_IQEXT); |
| 41 | break; |
| 42 | case 0xF002: IRQa=V&3; |
| 43 | if(IRQa&0x02) IRQCount=IRQLatch; |
| 44 | X6502_IRQEnd(FCEU_IQEXT); |
| 45 | break; |
| 46 | } |
| 47 | // if((A&0xF000)==0xF000) FCEU_printf("$%04x:$%02x, %d\n",A,V, scanline); |
| 48 | } |
| 49 | |
| 50 | static void Mapper27_hb(void) |
| 51 | { |
| 52 | // FCEU_printf("%02x-%d,%d,%d\n",scanline,IRQa,IRQCount,IRQLatch); |
| 53 | if(IRQa&0x2){ |
| 54 | if(IRQCount==0xFF){ |
| 55 | X6502_IRQBegin(FCEU_IQEXT); |
| 56 | IRQCount=IRQLatch+1; |
| 57 | } else { |
| 58 | IRQCount++; |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | void Mapper27_init(void) |
| 64 | { |
| 65 | int i; |
| 66 | for (i=0; i<9; i++) { |
| 67 | regchr[i]=0; |
| 68 | } |
| 69 | IRQa=0; |
| 70 | IRQCount=IRQLatch=0; |
| 71 | SetWriteHandler(0x8000,0xffff,Mapper27_write); |
| 72 | GameHBIRQHook=Mapper27_hb; |
| 73 | } |
| 74 | |