xwh@mentor.cc.purdue.edu (Ken Linger) (10/25/90)
While at first this may seem like a silly question, it may not be. I am beginning to think that my HP-28S Batteries are weakening (its been over two years and it is slowing down). Is it possible to change batteries without losing the memory? I know that the HP-41 series could have the batteries out for a few minutes (it had a capacitor or something). If I were to change the batteries quickly, before they went completely, is it possible to keep everything or should I just plan on losing my 32K? Any ideas? I think I know what responses I will get, but erspond anyway, please. Thanks. Ken Linger xwh@mentor.cc.purdue.edu
edp@jareth.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.)) (10/25/90)
In article <15642@mentor.cc.purdue.edu>, xwh@mentor.cc.purdue.edu (Ken Linger) writes: > Is it possible to change batteries without losing the memory? This may be a radical idea, but if you check the manual, in the appendix about batteries, I think you will find you have a minute to change the batteries. -- edp
berg@cip-s04.informatik.rwth-aachen.de (AKA Solitair) (10/25/90)
Ken Linger writes: >If I were to change the batteries quickly, before they went completely, is it >possible to keep everything or should I just plan on losing my 32K? Any ideas? Sounds like you didn't practice it before. Be sure to have a paperclip handy, fold it out, make a tiny (2mm) right angle at the end. Now open up the battery compartiment, stick in the paperclip, pull out the batteries. If you immediately replace them, then no memory should be lost. I don't know how long the capacitor will last if the batteries weren't full, but with full batteries it is known to last at least 3 minutes. -- Sincerely, berg%cip-s01.informatik.rwth-aachen.de@unido.bitnet Stephen R. van den Berg. "I code it in 5 min, optimize it in 90 min, because it's so well optimized: it runs in only 5 min. Actually, most of the time I optimize programs."
d90turpa@odalix.ida.liu.se (Ture Palsson) (10/26/90)
xwh@mentor.cc.purdue.edu (Ken Linger) writes: >If I were to change the batteries quickly, before they went completely, is it >possible to keep everything or should I just plan on losing my 32K? Any ideas? If you're quick enough, yes. To my experience, getting the new batteries in can be done in seconds. Replacing the lid on the battery slot, on the other hand, is slightly more problematic. I've changed batteries twice on my 28S. The first time I got "memory lost". The second time went ok, though. -- Ture Palsson d90turpa@odalix.ida.liu.se Alsattersgatan 3B:23 +46 13 260851 582 51 LINKOPING
akcs.azz710@hpcvbbs.UUCP (Jeffrey R. Broido) (10/26/90)
By all means, change the batteries. Get the new ones handy and be prepared to whack the case to get the old ones out (they were a very tight fit on both my 28C and 28S). Also, be VERY careful to get the polarity right. If you put the new ones in backwards, you probably will lose memory. Also, when you slide the cover back, be very careful you get it aligned right. MAKE SURE THE CALCULATOR IS OFF BEFORE YOU START THIS, AND DON'T HIT THE ON KEY WITH THE BATTERIES OUT! Good luck. I did it quite a few times with no trouble. Also, buy good batteries. I did a battery test recently and Radio Shack, Eveready Energizer and Kodak came out better than Panasonic, Duracell, Ray-O-Vac, etc.
jpser@cup.portal.com (John Paul Serafin) (10/27/90)
I bet all the die-hard HP41 users are wondering "What's all this fuss about changing batteries?" For those 28 owners on the brink of a 48 decision, the battery changing procedure is much less traumatic with a 48 (though not nearly as nice as with a 41 and 2 battery holders). John Serafin jpser@cup.portal.com