[GreenKeys] Using ASR 33 with PDP 11/05

Mon Mar 14 23:57:28 EDT 2011

Hi there!

I'm also a bit new to the list, but I also have a Model 33 machine.
Mine happens to be a KSR, but I do know that mine has the same CCU
code as yours. Using a handy little code chart that results in the
demystification of the UCC number codes, (the code chart can be found
here http://www.hertzmail.com/TTY/AnalysisCharts/ as "UCC-AC.pdf") we
can see that your CCU (and by extension mine) has:
> Private Line - Rotary power ON/OFF
> Printer Interconnections
> 500 Ma. Selector Magnet Driver (designed for 50-60 cps operation)
> Local Power Supply
> Convenience Outlet
> Duplex or Simplex Operation
> 15 pt. inter-connectors
> Wired for fully automatic reader control
> 48V AC Source for reader trip magnet

So, given the fact that it is listed as having been "wired for fully
automatic reader control" it should be capable of starting and
stopping the reader under the command of the PDP-11.

Now, in regards to a PDP-11 needing the teletype papertape
interface... that depends on whether or not you have a high
speed/standalone tape reader/punch, although the KL-11 (I think that's
the proper terminology, I'm not too familiar with module terms for the
PDP-11, but on the PDP-8 the console TTY interface is a KL board), is
most probably already configured to use the TTY reader/punch,
otherwise, I really have no idea what to do then (though, basing my
knowledge on what I know of the OMNIBUS PDP-8 systems, the KL8E (and
derivatives) could host the TTY's reader/punch without any
modification at all, so I assume the same regarding the PDP-11's
reader/punch).

Now, too bad you've got an 11/05; they're not as "blinky" as an 11/40,
/45, /50, /55 or /70, or as "historic" as the 11/20; but any 11 is
better the no 11 right?

Cheers to ya, and hope you get your ASR working with your 11/05.

On 13 March 2011 10:02, B Degnan <billdeg at degnanco.com> wrote:
> Hello.
> This is my first post, welcome from Landenberg, PA USA
>
> I have been working on a project to attach an ASR 33 teletype to my
> Digital Equipment minicomputer model PDP 11/05.  I am looking for
> someone who is familiar with this.    In addition to the two pairs of
> transmit and receive lines, I'd like to know if my teletype has the
> ability to be wired for papertape control.  DId the PDP 11 need
> this?  My ASR 33 has been modified possibly with the purpose of
> controlling the papertape reader.    Most teletypes that I have seen
> that have manual reader operations require one to hold the START
> lever in place, but this one allows a person to leave the switch in
> the START position.  The little cam that holds the lever in position
> is different, it has two notches rather than just one.  I have been
> comparing and contrasting two asr 33's, one standard, one with paper
> tape reader modifications.
>
> I have a documented details about what I have been doing here
> http://vintagecomputer.net/browse_thread.cfm?id=408
>
> Bottom line, I think I can probably just attach the two pairs of
> wires from the PDP 11 to the terminal strip 3,4,6,7 and be on my way,
> but the modification confuses me, I'd like to learn more about it and
> any opportunities it may present to my situation.
>
> (related thread about the pdp 11/05:)
> http://vintagecomputer.net/browse_thread.cfm?id=249
>
> Best
>
> Bill Degnan
> vintagecomputer.net
>
>
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