HP 15c CE - New firmware update officially available!

[Eric Rechlin]

(08-06-2024 01:34 PM)AnnoyedOne Wrote:  

(08-06-2024 12:15 PM)Dave Britten Wrote:  120 ms is much too high...

Agreed. The original HP-15C (1982) used 80ms or so. 50ms is about 2x human reaction time and should be plenty for normal keys/switches.

Perhaps Moravia should create such firmware.

I've used 80ms, 100ms, 120ms, and 150ms firmware variations on the 15c CE. As I recall, the 80ms firmware still can get double keystrokes so that is not going to work, much less 50ms.

150ms regularly exhibited the same issue Dave saw with intended keystrokes being missed. 120ms is better but I think 100ms is ideal.

Best of all would be if they allow it to be configurable (like on the 49/50 series), but without that, I think 100ms would be a better choice than the 120ms in the new official firmware. I was actually surprised they released it with 120ms firmware, since I had had good experience with the 100ms firmware that TheCalculatorStore was putting on their units.