So make sure you have some FRESH batteries handy, Silver Oxide batteries, i.e. Persistant little bastard thinks it's a smoke detector!!! Actually, when the calculator is off, it can detect a low-battery condition and an internal system flag is set which will make the calculator beep non-stop.
I'm no expert, but I remember reading in the archives that when the HP-42S calculator goes into it's beeping mode, it can mean one of two things:įirst: the calculator has a self protecting and anoying feature, as it sounds off automatically (beeping) warning you that my batteries are low and I need changing now! before I loose my continous memory and you loose your mind. I'm taking a nap and getting back to the keyboard in a few hours, if you don't mind. I'm just resting for a while as I'm writing a brief tutorial (in Portuguese) related to LaTeX instalation and use in a Linux environment. I think I'll be ready to get my daily HP-related activities back after the mid December, while I'm resuming some HP-related activities in the course. Anyway, be sure that I'd help as well, but as I mentioned, my spare time is "none". I'm sure you'll find people closer to you that will help you in any way you need. I'm collecting the HD's and related chips ID's so I can further search for their characteristics. No, they are not MFM units, instead some 170MBytes to 480MBytes IDE units. BTW, to those interested on this sort of upgrading, I found compatible 32KRAM chips in some "ancient" HD boards. That's why I remember reading about the continuous beep. I myself repaired some HP42S, and I also upgraded at least five units to 32KBytes RAM.
The only way is trying the "off-line" repair centers. The fact is that (sadly) HP no longer offers service for the HP42S. I read here some guys mentioning a sort of "repair center", not an HP repair center, that offers service for some HP calculators.
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