HP-65 - 1601A03250 - Compatibility Issues ? - Advice needed

[teenix]

(10-08-2019 09:48 PM)albertofenini Wrote:  Tony ... we fixed it !!
Look at the last three pictures of the album we published yesterday
First we changed the motor on the card reader and it didn’t improve
Then we mounted an older card reader on the keyboard logic that came with unit
And it worked ...
We will publish the versions of the boards but I’m convinced
that there are combinations that work and some that don’t work

Also I think this unit had been tampered
The case has a serial number 1601A but the CPU board is older
The switches were one in gold finish and the other in steel finish like those found on the HP67
So I think someone had mixed up things a bit ...

However we will measure the signals with t he scope for the keyboard
We want to learn something more about the HP65 ...
Thanks for help !!!

Good news, well done

Are the part numbers on the card RW ICs the same on the different boards?

cheers

Tony