[GreenKeys] ASR33 punch reader control line

[Christian Gauger-Cosgrove]

When plugged into a minicomputer there is all the reason in the world
to control the tape reader.

Mostly because if you *DON'T* well... "Hi yeah, you're going too fast,
so I'm just going to ignore what you're sending right now; oh wait
that's a critical program? Well I still don't give two damns, I'M
SKIPPING IT BECAUSE MY BUFFER IS FULL."

And that's why DEC added a reader control line set.


Cheers,
Christian




On 6 May 2013 17:29, Lester Veenstra <lester at veenstras.com> wrote:
> There should not be any need to "control" the tape reader other than using
> the lever switch on the reader itself.
>
>
> Lester B Veenstra  MØYCM K1YCM W8YCM
> lester at veenstras.com
>
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> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Trammell Hudson
> Sent: Sunday, May 05, 2013 2:11 PM
> To: greenkeys at mailman.qth.net
> Subject: [GreenKeys] ASR33 punch reader control line
>
> I'm attempting to connect an ASR33 with a current loop interface to a modern
> computer and am not sure how to connect the punch reader control lines.  In
> Local mode the punch reads fine and prints a copy of the tape as you can see
> in this video:
> http://www.flickr.com/photos/osr/8662034542/in/set-72157633270866016
>
> In Line mode, however, the tape reader does not do anything.  I believe the
> control line need to be pulsed to clock in one byte, but have not been able
> to find documentation on the interface specifications.  There are two
> remaining wires in the cable and the label says they are "+12v reader" and
> "Ctrl-line".  So I assume it is not yet another current loop, but sending
> various voltages on the control line (shorted to ground, to my interface's
> +5, to the +12v, etc) did not seem to have any affect.
>
> Thanks!
>
> --
> Trammell
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