| 1 | #include "mapinc.h"\r |
| 2 | \r |
| 3 | static uint32 regchr[9];\r |
| 4 | \r |
| 5 | static DECLFW(Mapper27_write)\r |
| 6 | {\r |
| 7 | int regnum;\r |
| 8 | A&=0xF00F;\r |
| 9 | if((A>=0xB000) && (A<=0xE003)) {\r |
| 10 | regnum=((((A>>12)+1)&0x03)<<1)|((A&0x02)>>1);\r |
| 11 | if(A&1)\r |
| 12 | regchr[regnum]=(regchr[regnum]&0x00F)|(V<<4);\r |
| 13 | else\r |
| 14 | regchr[regnum]=(regchr[regnum]&0x1F0)|(V&0xF);\r |
| 15 | VROM_BANK1(regnum<<10,regchr[regnum]);\r |
| 16 | }\r |
| 17 | switch(A)\r |
| 18 | {\r |
| 19 | case 0x8000: ROM_BANK8(0x8000|((regchr[8]&2)<<13),V); break;\r |
| 20 | case 0xA000: ROM_BANK8(0xa000,V); break;\r |
| 21 | case 0x9000: switch(V&3){\r |
| 22 | case 0:setmirror(MI_V);break;\r |
| 23 | case 1:setmirror(MI_H);break;\r |
| 24 | case 2:setmirror(MI_0);break;\r |
| 25 | case 3:setmirror(MI_1);break;\r |
| 26 | }\r |
| 27 | case 0x9002: regchr[8]=V; break;\r |
| 28 | case 0xF000: //X6502_IRQEnd(FCEU_IQEXT);\r |
| 29 | IRQLatch=(IRQLatch&0xF0)|(V&0x0F);\r |
| 30 | break;\r |
| 31 | case 0xF001: //X6502_IRQEnd(FCEU_IQEXT);\r |
| 32 | IRQLatch=(IRQLatch&0x0F)|((V&0xF)<<4);\r |
| 33 | break;\r |
| 34 | case 0xF003: IRQa=((IRQa&0x1)<<1)|(IRQa&0x1);\r |
| 35 | X6502_IRQEnd(FCEU_IQEXT);\r |
| 36 | break;\r |
| 37 | case 0xF002: IRQa=V&3;\r |
| 38 | if(IRQa&0x02) IRQCount=IRQLatch-1;\r |
| 39 | // X6502_IRQEnd(FCEU_IQEXT);\r |
| 40 | break;\r |
| 41 | }\r |
| 42 | // if((A&0xF000)==0xF000) FCEU_printf("$%04x:$%02x, %d\n",A,V, scanline);\r |
| 43 | }\r |
| 44 | \r |
| 45 | static void Mapper27_hb(void)\r |
| 46 | {\r |
| 47 | // FCEU_printf("%02x-%d,%d,%d\n",scanline,IRQa,IRQCount,IRQLatch);\r |
| 48 | if(IRQa&0x2){\r |
| 49 | if(IRQCount==0xFF){\r |
| 50 | X6502_IRQBegin(FCEU_IQEXT);\r |
| 51 | IRQCount=IRQLatch+1;\r |
| 52 | } else {\r |
| 53 | IRQCount++;\r |
| 54 | }\r |
| 55 | }\r |
| 56 | }\r |
| 57 | \r |
| 58 | void Mapper27_init(void)\r |
| 59 | {\r |
| 60 | int i;\r |
| 61 | for (i=0; i<9; i++) {\r |
| 62 | regchr[i]=0;\r |
| 63 | }\r |
| 64 | IRQa=0;\r |
| 65 | IRQCount=IRQLatch=0;\r |
| 66 | SetWriteHandler(0x8000,0xffff,Mapper27_write);\r |
| 67 | GameHBIRQHook=Mapper27_hb;\r |
| 68 | }\r |
| 69 | \r |