Today is a good day - an HP-28S saved

[rprosperi]

(04-15-2024 07:59 PM)8031Brown Wrote:  I recently found a box of my late father's HP "stuff". Manuals for his HP-67, the box, manuals and some app pacs and memory for his HP-41C, even some very old printer rolls. The calculators themselves will hopefully turn-up.

But also an HP-28S that I had no idea that he owned. Batteries left in it for about 15 years and not well stored but a little judicious cleaning of contacts with a bamboo skewer and a set of new Duracells and... it lives. It was complete in its original box with both manuals. Now I have to learn RPL!

__this from a happy HP Prime user - don't judge me

DON'T use Duracell batteries in any HP Device (or any other device). This Forum is overflowing with stories of how Duracell brand batteries damaged or even destroyed their precious devices. This is not a new phenomenon, HP sent a letter to HP-71B owners in 1984 about the danger of Duracell batteries in a 71B and they made some arrangement (long, long since void) whereby if you could provide evidence of machine damage to Duracell, they would cover the cost of the repair, or something to that effect.

Enjoy your 28S, enjoy learning RPL, and even enjoy thinking of your Dad learning RPL, but get some other brand of N cells in that machine ASAP. Depending on where you live, different quaility brands are available, including Energizer, Varta, Panasonic, etc. These do cost a bit more, but better than paying the price of a ruined machine.