[GreenKeys] Reader run relay?

[Simon Claessen]

i'm just curious (and in possession of two 33asr's myself apparently 
without the dec modification) what the schematic looks like and why they 
used a varactor or varicap? ald especially how it is connected to the 
rest of the teletypes.

simon

On 01-04-14 20:36, B Degnan wrote:
>>I've finished reforming capacitors, at least for the moment,
> including the capacitors in the Teletype's CCU.  While going
> over the cabling from the PDP-8 to the teletype, I realized
> that our teletype does not have DEC's standard modifications,
> specifically, it does not have the 4915 board with the
> reader-run relay.
>
>> If anyone has salvaged old ASR-33 Teletypes and undone DEC's
> modifications by removing the reader run relays, I'd like
> to get hold of the removed relays to put one into my Teletype.
> I did find a photo on line:
>
>> --http://so-much-stuff.com/pdp8/tty33/tty33.php
>
>> Of course, the TTY will work just fine without the reader-run
> circuit, relying on someone to start the reader after the
> software is ready for it, but it would be nice to have it.
>
>> Also, I have heard that there are other ways that DEC installed
> the reader-run circuitry, before they came out with the 4915
> board.  Documentation of that would be nice, since I am working
> with a 1966 vintage machine.
>
>>		Doug Jones
>>		jones at cs.uiowa.edu  <mailto:jones at cs.uiowa.edu>
>
>
> Doug - I have been looking for one of these off and on for a while now myself.  If I find 2, or if you do....let's stay in touch.
>
> Bill
>
> vintagecomputer.net
>
>
>
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-- 
Met vriendelijke Groet,

Simon Claessen
drukknop.nl