CODE

# attempt to create a chip8 interpreter from random import uniform import msvcrt,StringIO def cpu8(instr,regs,I,PC): opcode=instr/4096 instr=instr-4096*opcode if opcode==0: PC=opcode0(instr,PC) elif opcode==1: print "%X: jump %X"%(PC,instr) PC=instr elif opcode==2: stack.append(PC) print "%X: jsr %X"%(PC,instr) PC=instr elif opcode==3: register=int(instr/256) value=instr-256*register print "%X: skeq V%X,%X"%(PC,register,value) if regs[register]==value: PC+=4 else: PC+=2 elif opcode==4: register=int(instr/256) value=instr-256*register print "%X: skne v%X,%X"%(PC,register,value) if regs[register]==value: PC+=2 else: PC+=4 elif opcode==5: register1=int(instr/256) register2=int((instr-256*register1)/16) print "%X: skeq V%X,V%X"%(PC,register1,register2) if regs[register1]==regs[register2]: PC+=4 else: PC+=2 elif opcode==6: register=int(instr/256) value=instr-256*register regs[register]=value print "%X: mov V%X,%X"%(PC,register,value) PC+=2 elif opcode==7: register=int(instr/256) value=instr-256*register regs[register]+=value print "%X: add V%X,%X"%(PC,register,value) PC+=2 elif opcode==8: register1=int(instr/256) register2=int((instr-256*register1)/16) value=instr-256*register1-16*register2 opcode8(register1,register2,value,PC) PC+=2 elif opcode==9: register1=int(instr/256) register2=int((instr-256*register1)/16) print "%X: skne V%X,V%X"%(PC,register1,register2) if regs[register1]==regs[register2]: PC+=2 else: PC+=4 elif opcode==0xA: I=instr print "%X: mvi %X"%(PC,instr) PC+=2 elif opcode==0xB: print "%X: jmi %X"%(PC,instr) PC=instr+regs[0] elif opcode==0xC: register=int(instr/256) seed=instr-256*register regs[register]=int(uniform(0,seed+1)) print "%X: rand V%X,%X"%(PC,register,seed) PC+=2 elif opcode==0xD: register1=int(instr/256) register2=int((instr-256*register1)/16) height=instr-256*register1-16*register2 print "%X: sprite V%X,V%X,%X"%(PC,register1,register2,height) # sprite(register1,register2,height,I) PC+=2 elif opcode==0xE: register=int(instr/256) value=instr-register*256 PC=opcodeE(register,value,PC) PC+=2 elif opcode==0xF: register=int(instr/256) value=instr-register*256 I=opcodeF(register,value,PC,I) PC+=2 return PC,I def opcode0(value,PC): if value==0xE0: print "%X: cls"%(PC) PC+=2 elif value==0xEE: print "%X: rts"%(PC) PC=stack.pop()+2 else: print "NoOp" PC=0 return PC def opcode8(register1,register2,value,PC): if value==1: regs[register1]=regs[register2] print "%X: mov V%X,V%X"%(PC,register1,register2) elif value==2: regs[register1]=regs[register1]|regs[register2] print "%X: or V%X,V%X"%(PC,register1,register2) elif value==3: regs[register1]=regs[register1]&regs[register2] print "%X: and V%X,V%X"%(PC,register1,register2) elif value==4: regs[register1]=regs[register1]^regs[register2] print "%X xor V%X,V%X"%(PC,register1,register2) elif value==5: regs[register1]+=regs[register2] if regs[register1]>0xFF: regs[0xF]=1 regs[register1]=regs[register1]%0xFF print "%X add V%X,V%X"%(PC,register1,register2) elif value==7: regs[register1]-=regs[register2] if regs[register1]<0: regs[register1]+=0xFF regs[0xF]=1 print "%X sub V%X,V%X"%(PC,register1,register2) elif value==6: regs[0xF]=regs[register1]&1 regs[register1]=regs[register1]>>1 print "%X: shr V%X"%(PC,register1) elif value==0xE: regs[0xF]=regs[register1]&128 regs[register1]=regs[register1]<<1 print "%X: shl V%X"%(PC,register1) def opcodeE(register,value,PC): if value==0x9E: if msvcrt.kbhit()==1: a=msvcrt.getch() if ord(a)==value: PC+=2 print "%X: skpr V%X"%(PC,register) elif value==0xa1: if msvcrt.kbhit()==1: a=msvcrt.getch() if ord(a)<>value: PC+=2 print "%X: skup V%X"%(PC,register) return PC def opcodeF(register,value,PC,I): if value==0x07: regs[register]=delay[0] print "%X: gdelay V%X"%(PC,register) elif value==0x0A: key=msvcrt.getch() regs[register]=key print "%X: key V%X"%(PC,register) elif value==0x15: delay[0]=regs[register] print "%X: sdelay V%X"%(PC,register) elif value==0x18: delay[1]=regs[register] print "%X: ssound V%X"%(PC,register) elif value==0x1e: I+=regs[register] print "%X: adi V%X"%(PC,register) elif value==0x29: i=regs[register]*5 print "%X: font V%X"%(PC,register) elif value==0x33: print "%X: bcd V%X"%(PC,register) #need info about binary coded decimal elif value==0x55: fil=StringIO(memory) fil.seek(I) for a in range(register): fil.write(chr(regs[a])) I+=1 print "%X: str V0-V%X"%(PC,register) elif value==0x65: for a in range(register): regs[a]=ord(memory[I]) I+=1 print "%X: ldr V0-V%X"%(PC,register) return I def gdelay(): #refresh should be 60Hz if delay[0]!=0 or delay[1]!=0: if delay[0]==0: delay[1]-=1 else: delay[0]-=1 regs=[0]*16 stack=[] screen=" "*32*64 delay=[0]*2 PC=0x200 I=0 memory="" # load a 4x5 font file=open("rom.bin","rb") memory+=file.read() file.close() memory+=" "*(0x200-len(memory)) #load a program file=open("pong","rb") memory+=file.read() file.close() print memory while PC<>0: intr=ord(memory[PC])*256+ord(memory[PC+1]) PC,I=cpu8(intr,regs,I,PC) gdelay() print "registers:", regs print "stack:",stack print "I: 0x%X"%I

bon si quelqu'un sait comment faire en sorte que les delay[0] et delay[1] decompte à 60 Hz, qu'il n'hésite pas

( rq : je devrais tout de même commencer à m'attaquer à la partie "graphique" histoire de voir si toutes mes instructions marchent au poil ... )

10 CLS

20 ATTRB 1,1

30 DO

40 PRINT "Rien capté"

50 LOOP



run

c'est un interpréteur chip8 : le pb est qu'il me faut deux "decompteur" qui tournent imperativement à 60 Hz ... et ça, je ne vois pas trop comment le faire ... ( à moins d'aller le plus vite possible et d'ensuite ralentir l'emulation dans son ensemble ? )

Des threads ?

dès que je me rappellerai ce que c'est, je verrais ...

Tu prog vraiment comme un porc momo le basic amstrad c'est pas un modèle niveau architecture de prog

ben mon leitmotiv c'est "à partir du moment où ça marche ..."