HP41.org

Just asking. I have this 41C that I bought in 1979 that started to act up after I cleaned it. I think I got it fixed though, by removing the modules (Circuits1, Math1 and Quad Mem), but it would be nice to have the service module

When the unit "acted up" it would do this:

1 enter 1 + -> 1
2 enter 2 y^x -> 2
Or just simply ligt up the bottom bar of the second display position.

The SERVICE module is a very rare item and hard to get. However, there are several solutions to use the ROM image in other hardware, like the Clonix or NoVRAM (see clonix41.org) or (my own design) the TULIP4041 (see https://github.com/mjakuipers/TULIP-DevBoard). For the latter, best contact me via the hpmuseum.org messaging system.

Thanks! We can discuss this further this saturday!