}\r
#endif\r
\r
-static int PadRead(int i)\r
-{\r
- int pad=0,value=0,TH;\r
- pad=~PicoPad[i]; // Get inverse of pad MXYZ SACB RLDU\r
- TH=Pico.ioports[i+1]&0x40;\r
-\r
- if(PicoOpt & 0x20) { // 6 button gamepad enabled\r
- int phase = Pico.m.padTHPhase[i];\r
-\r
- if(phase == 2 && !TH) {\r
- value=(pad&0xc0)>>2; // ?0SA 0000\r
- goto end;\r
- } else if(phase == 3 && TH) {\r
- value=(pad&0x30)|((pad>>8)&0xf); // ?1CB MXYZ\r
- goto end;\r
- } else if(phase == 3 && !TH) {\r
- value=((pad&0xc0)>>2)|0x0f; // ?0SA 1111\r
- goto end;\r
- }\r
- }\r
-\r
- if(TH) value=(pad&0x3f); // ?1CB RLDU\r
- else value=((pad&0xc0)>>2)|(pad&3); // ?0SA 00DU\r
-\r
- end:\r
-\r
- // orr the bits, which are set as output\r
- value |= Pico.ioports[i+1]&Pico.ioports[i+4];\r
-\r
- return value; // will mirror later\r
-}\r
-\r
-u8 z80Read8(u32 a)\r
-{\r
- if(Pico.m.z80Run&1) return 0;\r
-\r
- a&=0x1fff;\r
-\r
- if(!(PicoOpt&4)) {\r
- // Z80 disabled, do some faking\r
- static u8 zerosent = 0;\r
- if(a == Pico.m.z80_lastaddr) { // probably polling something\r
- u8 d = Pico.m.z80_fakeval;\r
- if((d & 0xf) == 0xf && !zerosent) {\r
- d = 0; zerosent = 1;\r
- } else {\r
- Pico.m.z80_fakeval++;\r
- zerosent = 0;\r
- }\r
- return d;\r
- } else {\r
- Pico.m.z80_fakeval = 0;\r
- }\r
- }\r
-\r
- Pico.m.z80_lastaddr = (u16) a;\r
- return Pico.zram[a];\r
-}\r
-\r
\r
// for nonstandard reads\r
#ifndef _ASM_MEMORY_C\r
static\r
#endif\r
-u32 UnusualRead16(u32 a, int realsize)\r
+u32 OtherRead16End(u32 a, int realsize)\r
{\r
u32 d=0;\r
\r
return d;\r
}\r
\r
-#ifndef _ASM_MEMORY_C\r
-static\r
-#endif\r
-u32 OtherRead16(u32 a, int realsize)\r
-{\r
- u32 d=0;\r
-\r
- if ((a&0xff0000)==0xa00000) {\r
- if ((a&0x4000)==0x0000) { d=z80Read8(a); d|=d<<8; goto end; } // Z80 ram (not byteswaped)\r
- if ((a&0x6000)==0x4000) { if(PicoOpt&1) d=YM2612Read(); else d=Pico.m.rotate++&3; dprintf("read ym2612: %04x", d); goto end; } // 0x4000-0x5fff, Fudge if disabled\r
- d=0xffff; goto end;\r
- }\r
- if ((a&0xffffe0)==0xa10000) { // I/O ports\r
- a=(a>>1)&0xf;\r
- switch(a) {\r
- case 0: d=Pico.m.hardware; break; // Hardware value (Version register)\r
- case 1: d=PadRead(0); d|=Pico.ioports[1]&0x80; break;\r
- case 2: d=PadRead(1); d|=Pico.ioports[2]&0x80; break;\r
- default: d=Pico.ioports[a]; break; // IO ports can be used as RAM\r
- }\r
- d|=d<<8;\r
- goto end;\r
- }\r
- // |=0x80 for Shadow of the Beast & Super Offroad; rotate fakes next fetched instruction for Time Killers\r
- if (a==0xa11100) {\r
- d=Pico.m.z80Run&1;\r
-#if 0\r
- if (!d) {\r
- // do we need this?\r
- extern int z80stopCycle; // TODO: tidy\r
- int stop_before = SekCyclesDone() - z80stopCycle;\r
- if (stop_before > 0 && stop_before <= 16) // Gens uses 16 here\r
- d = 1; // bus not yet available\r
- }\r
-#endif\r
- d=(d<<8)|0x8000|Pico.m.rotate++;\r
- dprintf("get_zrun: %04x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), SekPc);\r
- goto end; }\r
-\r
-#ifndef _ASM_MEMORY_C\r
- if ((a&0xe700e0)==0xc00000) { d=PicoVideoRead(a); goto end; }\r
-#endif\r
-\r
- d = UnusualRead16(a, realsize);\r
-\r
-end:\r
- return d;\r
-}\r
\r
//extern UINT32 mz80GetRegisterValue(void *, UINT32);\r
\r
-static void OtherWrite8(u32 a,u32 d,int realsize)\r
+static void OtherWrite8End(u32 a,u32 d,int realsize)\r
{\r
- if ((a&0xe700f9)==0xc00011||(a&0xff7ff9)==0xa07f11) { if(PicoOpt&2) SN76496Write(d); return; } // PSG Sound\r
- if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)d; return; } // Z80 ram\r
- if ((a&0xff6000)==0xa04000) { if(PicoOpt&1) emustatus|=YM2612Write(a&3, d); return; } // FM Sound\r
- if ((a&0xffffe0)==0xa10000) { // I/O ports\r
- a=(a>>1)&0xf;\r
- // 6 button gamepad: if TH went from 0 to 1, gamepad changes state\r
- if(PicoOpt&0x20) {\r
- if(a==1) {\r
- Pico.m.padDelay[0] = 0;\r
- if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;\r
- }\r
- else if(a==2) {\r
- Pico.m.padDelay[1] = 0;\r
- if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;\r
- }\r
- }\r
- Pico.ioports[a]=(u8)d; // IO ports can be used as RAM\r
- return;\r
- }\r
- if (a==0xa11100) {\r
- extern int z80startCycle, z80stopCycle;\r
- //int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
- d&=1; d^=1;\r
- if(!d) {\r
- // this is for a nasty situation where Z80 was enabled and disabled in the same 68k timeslice (Golden Axe III)\r
- if (Pico.m.z80Run) {\r
- int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
- z80stopCycle = SekCyclesDone();\r
- lineCycles=(lineCycles>>1)-(lineCycles>>5);\r
- z80_run(lineCycles);\r
- }\r
- } else {\r
- z80startCycle = SekCyclesDone();\r
- //if(Pico.m.scanline != -1)\r
- }\r
- dprintf("set_zrun: %02x [%i|%i] @%06x", d, Pico.m.scanline, SekCyclesDone(), /*mz80GetRegisterValue(NULL, 0),*/ SekPc);\r
- Pico.m.z80Run=(u8)d; return;\r
- }\r
- if (a==0xa11200) { dprintf("write z80Reset: %02x", d); if(!(d&1)) z80_reset(); return; }\r
-\r
- if ((a&0xff7f00)==0xa06000) // Z80 BANK register\r
- {\r
- Pico.m.z80_bank68k>>=1;\r
- Pico.m.z80_bank68k|=(d&1)<<8;\r
- Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one\r
- return;\r
- }\r
-\r
- if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)(d|(d<<8))); return; } // Byte access gets mirrored\r
-\r
// sram\r
//if(a==0x200000) dprintf("cc : %02x @ %06x [%i|%i]", d, SekPc, SekCyclesDoneT(), SekCyclesDone());\r
//if(a==0x200001) dprintf("w8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());\r
Pico.m.prot_bytes[(a>>2)&1] = (u8)d;\r
}\r
\r
-static void OtherWrite16(u32 a,u32 d)\r
-{\r
- if ((a&0xe700e0)==0xc00000) { PicoVideoWrite(a,(u16)d); return; }\r
- if ((a&0xff4000)==0xa00000) { if(!(Pico.m.z80Run&1)) Pico.zram[a&0x1fff]=(u8)(d>>8); return; } // Z80 ram (MSB only)\r
-\r
- if ((a&0xffffe0)==0xa10000) { // I/O ports\r
- a=(a>>1)&0xf;\r
- // 6 button gamepad: if TH went from 0 to 1, gamepad changes state\r
- if(PicoOpt&0x20) {\r
- if(a==1) {\r
- Pico.m.padDelay[0] = 0;\r
- if(!(Pico.ioports[1]&0x40) && (d&0x40)) Pico.m.padTHPhase[0]++;\r
- }\r
- else if(a==2) {\r
- Pico.m.padDelay[1] = 0;\r
- if(!(Pico.ioports[2]&0x40) && (d&0x40)) Pico.m.padTHPhase[1]++;\r
- }\r
- }\r
- Pico.ioports[a]=(u8)d; // IO ports can be used as RAM\r
- return;\r
- }\r
- if (a==0xa11100) { OtherWrite8(a, d>>8, 16); return; }\r
- if (a==0xa11200) { dprintf("write z80reset: %04x", d); if(!(d&0x100)) z80_reset(); return; }\r
\r
- OtherWrite8(a, d>>8, 16);\r
- OtherWrite8(a+1,d&0xff, 16);\r
-}\r
+#include "MemoryCmn.c"\r
+\r
\r
// -----------------------------------------------------------------\r
// Read Rom and read Ram\r
notaz.gp2x.de / picodrive.git / blobdiff