[GreenKeys] Help to identify an old "SELCAL" circuit board

[Bob Camp]

Hi

This looks a lot like a nearly one of a kind board. I don't know 
anything about it except what I can see:

1) Lots of wires on the back of the board
2) Even for the 1970's a fairly simple board layout
3) The ham calls are etched into the board - probably the guys who made 
them.
4) The holes are hand drilled. Even for the early 1970's = low volume / 
prototype stuff

What kind of chips went in the two big socket areas? That might help 
figure out what's going on.

	Enjoy!

		Bob Camp
		KB8TQ



On Jul 1, 2004, at 9:17 PM, YIR wrote:

> I collect Teletype and related gear.  I have a circuit board with 32
> chips
> on it and after removing a couple of the large chips I discovered
> a couple of Mars calls from 1974.  I suspect this board has to do with
> "selective calling" in conjunction with using a Terminal Unit etc.
> Hopefully someone will remember something about this board and
> tell me what it is supposed to really do.  And of course where to find
> technical data.
>
> Please have a look at these photo links and let me know if you can 
> help.
>
> Thanks,  Pat  K7YIR   ex N0ETG  ex N0MOD  ex N0MTP
>
>  http://mysite.verizon.net/res17bfm/selcal-1.jpg
>  http://mysite.verizon.net/res17bfm/selcal-2.jpg
>  http://mysite.verizon.net/res17bfm/selcal-3.jpg
>  http://mysite.verizon.net/res17bfm/selcal-4.jpg
>  http://mysite.verizon.net/res17bfm/selcal-5.jpg
>  http://mysite.verizon.net/res17bfm/selcal-6.jpg
>
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