HP-29C now has dots across the display...

[AnnoyedOne]

(09-02-2024 01:32 PM)teenix Wrote:  Maybe the offending voltage was messing with the ACT which gets its low power indication from the power monitor IC.

Interesting. I don't own (I've seen the prices of working ones!) a HP-29C (but have a PC simulator), or any other Woodstock model, but I think my uncle did (a 25 or 29C). He was an engineer too but of a different type. Both are long gone.

If I had the 29C in question I'd hook up a variable power supply and slowly dial the voltage down and observe what happens.

Perhaps the 29C has an initial blinking DP but shifts to all DP's at a lower voltage level.

The engineer in me wants to experiment

A1