Wanted: PIK chip for Topcat

[teenix]

(04-01-2020 08:03 PM)achim Wrote:  Hi all,

I have a HP91 with defective PIK chip (1820-1680). I'm looking for a spare part or a defective HP91/92/97 for parts.

Achim (Germany)

You will need a PIK chip from the HP-91. There are only 64 characters available for the PIK chip to print so it is not possible to cater for all calculator models with the one chip. They have a ROM which is programmed by the factory to have different sets of print characters for the different calculator models.

An example, the HP-97 has lowercase (a) whereas the HP-91 has (theta) at the same character ROM location.

They have different part numbers too.

cheers

Tony