HP-21 repaired

[rprosperi]

(06-20-2017 09:21 PM)PANAMATIK Wrote:  I didn't know about the existence of the HP-21 calculator until some years ago. When I saw it the first time I thought: very peculiar how naked it appeares without any printing on the keyboard bezel and only one blue prefix key! Now I really like this calculator.

It was not until many years later that I saw an old HP ad noting that the HP-21 was the updated replacement for the original HP-35. All these years later, my fingers still have 'muscle memory' for some functions on the HP-21. My strongest are the HP-41 and HP-71 as I used those for many more years each, but it's interesting that some things still feel 'familiar' on this machine more than 40 years later.