HP-67 1705A01234 [erase other's cards, writes and sometime read back its own cards]

[albertofenini]

Thanks Tony
I’ll surely check it
Still, it fails me how is it possible that just reading a card can damaged it
so that any other unit, including the one that has originally recorded it, will
not be able to read it again …
I’ll check it better tomorrow and let you know

When you says “make sure WE stays low” you mean it has to be ground connected right?
And when it should go low and how long it should stay low ?

Thanks !!!