HP-65 CPU Board

[albertofenini]

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