HP48G Series Keyboard Hardware
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07-05-2023, 04:35 PM
Post: #6
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RE: HP48G Series Keyboard Hardware
Steve:
Thank you very much! That is great detail. I had recalled reading about this before but did not recall exactly where (until your detail here!!!) I may need to study the resistance of these paths in more detail. I recall that they were not all the same, but perhaps my measurement technique was flawed. I had documented the address line paths to the keyboard fingers/contacts and the PCB access points, but alas my 'googlepage' has since gone dormant (and I cannot not find my local copies!). I'll dig in as time allows and better/more permanently document my findings. Regards, TomC (07-05-2023 12:25 PM)Steve Simpkin Wrote: The June 1991 issue of HP Journal magazine discusses the HP-48SX keyboard PCB briefly starting on page 31. Some of the key characteristics are: |
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Messages In This Thread |
HP48G Series Keyboard Hardware - TomC - 07-03-2023, 04:16 PM
RE: HP48G Series Keyboard Hardware - Diego Diaz - 07-03-2023, 10:42 PM
RE: HP48G Series Keyboard Hardware - TomC - 07-04-2023, 10:27 AM
RE: HP48G Series Keyboard Hardware - franz.b - 07-05-2023, 11:27 AM
RE: HP48G Series Keyboard Hardware - Steve Simpkin - 07-05-2023, 12:25 PM
RE: HP48G Series Keyboard Hardware - TomC - 07-05-2023 04:35 PM
RE: HP48G Series Keyboard Hardware - Steve Simpkin - 07-05-2023, 05:10 PM
RE: HP48G Series Keyboard Hardware - ijabbott - 07-05-2023, 08:20 PM
RE: HP48G Series Keyboard Hardware - BruceH - 07-07-2023, 08:27 PM
RE: HP48G Series Keyboard Hardware - TomC - 07-08-2023, 11:57 AM
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