HP-65 more on the card reader

[albertofenini]

LAST UPDATE

We decided to be brave and we moved the Cathode and Anode Drivers from the faulty keyboard
to the spare keyboard.

The machine turned-on fine, the move didn't hurt the drivers,
reading from a card was good, but writing had exactly the same problem ...

Now ... given that last night we fixed the unit S/N 1511 by swapping the keyboard and it
worked out, the only thing that we can think of, is that the problem is in the active components
i.e. the Anode and the Cathode Driver.

Next time we will measure if the display signal is clean or not, as this looks to be the only possible
explanation

Take care !!!