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HP-65 - 1601A03250 - Compatibility Issues ? - Advice needed
10-08-2019, 02:00 AM
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teenix Offline
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RE: HP-65 1601A03250 - Compatibility Issues ? - Advice needed
(10-07-2019 11:05 PM)albertofenini Wrote:  ciao Tony,
what do you suggest to troubleshoot the behavior of this unit ?
take care !

Hard to say.

I would use your oscilloscope to check the keyboard row outputs and make sure they change state when the appropriate keys are pressed.

I have a simplified HP65 schematic in this zip file which may help.

http://www.teenix.org/classSchm.zip

The card read/write signals can be confirmed with the oscilloscope also.

cheers

Tony
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RE: HP-65 1601A03250 - Compatibility Issues ? - Advice needed - teenix - 10-08-2019 02:00 AM



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