HP42S with bad LCD

[Geoff Quickfall]

The presentation is a fun one with some videos.

A tear down and restoration looking at the same component design that HP used in the same era.

Definitely a machine that was to be repaired and not discarded!

But the manual covers that and the programs appendix I created shows the subroutine and conditional testing the manual did not.

As well as using the ‘user’ assigned keys A, B, C, X & Y.

Anyhow, it is a beautiful machine with a gorgeous display:




Cheers