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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 Message-ID: <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 found 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 drawing 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 initial 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 gracefully when that power was lost. Regards, Jeff Little