Re: Writing emulator...

[steve@dosius.zzn.com (Dosius)]

Mike Guidero <mike@bogus.net> wrote in message news:<uo6rgrgl5vmf45@corp.supernews.com>...
> Dosius wrote:
> > Apple II Oasis 2.4 puts it in Slot 5 and it works...  It does find the
> > card, because there is a switch to Z80 mode and back.
> 
> This code in DAPPLE.C v. 0.72, Wr6502():
> 
> // if (Addr>=50432 && Addr<=50687)
>  if (Addr==50432)
>  {
>   if (cpuinuse==emuZ80) /* from manual */
>   {
>    proc.A=RAM[0x45];
>    proc.X=RAM[0x46];
>    proc.Y=RAM[0x47];
>    proc.P=RAM[0x48];
>    proc.S=RAM[0x49];
> // proc.PC.W=0x3D0;
>    proc.PC.B.l=RAM[0x3D0];
>    proc.PC.B.h=RAM[0x3D1];
>    cpuinuse=emu6502;
>    return;
>   }
>   cpuinuse=emuZ80;
>   return;
>  }
> 
> The register assignments are handled in the CP/M software.  You shouldn't be 
> doing them in the emulator.
> 
> Mike
Not sure, because the manual did say this - but if I omit them, I get
different results - yes, I get CP/M, but the output is garbled.