HP-65 CPU Board - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP-65 CPU Board (/thread-13740.html) |
HP-65 CPU Board - teenix - 10-01-2019 01:10 AM Hi all, I think I read somewhere that the HP-65 might have had different CPU board revisions which may have changed the order of the pins that connect to the key/display circuit board. Anyone know if this is the case? cheers Tony RE: HP-65 CPU Board - Johnboy - 10-01-2019 05:17 AM Hi Tony, I am pretty sure that is not the case. I have swapped 65 logic / display boards without issue. If you can get your hands on Tony Duell's circuit diagrams, there was only one HP65 circuit diagram shown. Cheers, John RE: HP-65 CPU Board - Dave Frederickson - 10-01-2019 11:00 PM (10-01-2019 05:17 AM)Johnboy Wrote: If you can get your hands on Tony Duell's circuit diagrams, there was only one HP65 circuit diagram shown. Tony Duell's schematics are now free. http://www.hpcc.org/cdroms/schematics5.0.zip RE: HP-65 CPU Board - teenix - 10-02-2019 05:08 AM (10-01-2019 11:00 PM)Dave Frederickson Wrote:(10-01-2019 05:17 AM)Johnboy Wrote: If you can get your hands on Tony Duell's circuit diagrams, there was only one HP65 circuit diagram shown. Thanks for the info :-) I've also put up some simplified schematics for classics http://www.teenix.org/classSchm.zip cheers Tony RE: HP-65 CPU Board - albertofenini - 10-02-2019 08:56 PM Hi everyone, we have quite a number of HP65 in our collection, and as of today we have met two different versions of the logic board, also the CPU chip has a different aspect. In the old ones (1333A series) the pins are gold and clamped to the ceramic structure, I mean you can see them even looking from above (if you know what I mean) in the newer ones the pins are only under the ceramic layer of the the CPU, however the schematics is the same. We have found some incompatibilities between the keyboard pcb and the card reader, in some old posts we have written about it, someone may remember. Hope this helps, take care RE: HP-65 CPU Board - teenix - 10-03-2019 12:56 AM Hi Alberto, I checked older posts and only found reference to the CPU pin differences. Do you have more info on keyboard and card incompatibilities? cheers Tony RE: HP-65 CPU Board - albertofenini - 10-07-2019 10:09 PM Tony look at this thread of mine : HP-65 1601A03250 - Compatibility Issues ? - Advice needed we may have just run into one of these incompatibilities issue again ... I'll keep you updated on the next steps ... take care |