Re: ADTPro Audio - fails

[zzjoki@gmail.com]

On Sep 2, 12:34 am, "Michael J. Mahon" <mjma...@aol.com> wrote:
> John wrote:
> > Hi,
>
> > I'm attempting to load the audio client via audio and the Apple never
> > returns from the
> > *2000.555CR <enter> command. I have checked the cables, switched
> > cables, and fiddled with the volume up and down almost full scale.
> > Never get a beep or error message.
>
> > The PC host seems to be sending audio data, at least it squeals if I
> > remove the cable from the PC audio out side.
>
> > Anyone get this to work? Are mono cables ok?
>
> They should be mono.  There are no stereo connectors involved.
> In fact, stereo plugs on the Apple side may cause problems.  Use
> a "stereo to mono" cable or adapter.
>
> > Also, is there a way to get some sort of feedback from the Apple to
> > see if it is seeing any signals coming off the cassette-in port? For
> > example, the TRS-80 had a pair of blinking indicators and one could
> > sort of tell what was happening during cassette input by looking at
> > their activity.
>
> Here's a short loop that will "echo" the cassette input to the speaker:
>
> 300-  AD 60 C0  lda  $C060  ; Read cassette input
> 303-  AA        tax         ; Save previous value
> 304-  8A        txa         ; Restore previous value
> 305-  4D 60 C0  eor  $C060  ; Has it changed?
> 308-  10 FA     bpl  $304   ; -No, keep sampling.
> 30A-  8D 30 C0  sta  $C030  ; -Yes, toggle speaker.
> 30D-  8A        txa         ;   Complement the
> 30E-  49 80     eor  #$80   ;    previous value
> 310-  4C 03 03  jmp  $303   ;     and continue.
>
> No offense, but also be sure that you are playing the output of the
> PC into the Apple's cassette *input*.  ;-)
>
> -michael
>
> AppleCrate II: An Apple II "blade server"!
> Home page:  http://members.aol.com/MJMahon/
>
> "The wastebasket is our most important design
> tool--and it's seriously underused."

Thanks again Michael and Schmidtd -- the audio feeback code of
Michael's revealed that my volume needed to be 100% up and full left.
Below about 80% the Apple fell silent.

The audio client was tranfered 1st time at this level, now onward.