HP97 The journey begins
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03-04-2020, 12:58 AM
(This post was last modified: 03-04-2020 12:59 AM by teenix.)
Post: #209
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RE: HP97 The journey begins
Hi all,
I have been looking into a replacement for both the HP-97 CPU and printer interface boards. The 55, 65 and 67 boards are simple plug in replacements but the 97 is a bit different. I'll keep looking, but I have not found replacements for the card reader and print head ribbon connectors so these would have to be removed from the original board and resoldered to the new one. I am not sure, but there appears to be differing CPU boards for the 97 and if so, I don't know if the interfacing pins to the key/display boards are the same. Most of the functionality of the 97 is similar to the 67 so a lot of work has already be done. The extra work is in getting the new processor to model the PIK chip and printer interface of which I am looking into now. Assuming I get this functional, and while in the design phase, are there any ideas for additional periferals. Things like a real time clock, GPS module, etc. I have also been looking into an interface like the 97-IO model but the BCD digit inputs seem a bit cumbersome with lots of wiring. For example, if you have a analog signal representing weight, temperature etc., or digital signals, you would have to create purpose built circuits to generate the HP-97 BCD input data. A trivial task for a modern microcontroller I guess, but maybe just a simple analog input, a few digital inputs which would cause a program run from LBL A, execute R/S or Pause, and keep the original flag outputs. Ideas welcome :-) cheers Tony |
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