New HP39gs defective?

[burkhard]

Perhaps you missed it, but there was discussion recently on another thread that wandered into mention of a nice aplet for the 39gs & 40gs that makes it work as a proper RPM calculator.

I installed it on my own "el cheapo out of Red China" 39gs and indeed it works great. Very nice!
Post #6 has both the aplet and the final (?) instructions. Give it a shot.

https://www.hpmuseum.org/forum/thread-9461.html