Intercept Jr. Schematics
mc at media.mit.edu
Thu Apr 16 21:38:03 CDT 2009
Thanks for providing the schematics, Jeff.
Where would I find them? Do I have to log into a web site?
(I'm not sure I could remember the password if the mailing list
has such a file repository.)
> Date: Wed, 15 Apr 2009 18:03:32 -0700
> From: "Jeff Little (jeflittl)" <jeflittl at cisco.com>
> Subject: Intercept Jr. Schematics
> To: <bob at jfcl.com>, "Ethan Dicks" <ethan.dicks at gmail.com>, "Steve
> Stutman" <steve at radiorobots.com>, "Tony Eros" <teros at doelegal.com>
> Cc: cctech at classiccmp.org
> <B2900A9E966E5B49966F0F448614E6F4072A8C0C at xmb-sjc-221.amer.cisco.com>
> Content-Type: text/plain; charset="us-ascii"
> To All:
> Just in case anyone was interested, here are the schematics that I
> for the Intercept Jr. and two of its accessory boards that were done
> about 1975 or 1976. Your's truly drew all three of these on the
> board with pencil and straightedge. They were then turned into
> publishable versions by a graphic artist. The two boards plus a third
> one which had a number "devices" on it for lab demos made up the
> Intercept Jr. product set. This was used to support the original
> education classes that were based around this design.
> Still looking for listings of the micro-interpreter. This was the
> software that made use of the special keyboard and was embedded in the
> mask-programmed IM6312 ROM.
> You can see that the serial interface on the PIEART was arranged to
> support either an RS-232C interface or the old-fashioned 20ma current
> loop for communication with an ASR-33 Teletype.
> On the RAM module, the board held a set of two AA batteries to provide
> battery back-up on the RAM memory. It may be hard to believe but I do
> seem to remember that Intersil actually patented the little circuit in
> the upper right hand corner that prevented these batteries from being
> back-biased when the regular power was on and kicked them in
> when that power was lost.
> Jeff Little
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