![]() RoadPro RPCA-421 (basic, bought this at a Pilot gas station near Palm Springs, CA)Ī Scientific calculator I got at Rite Aid (clone of Sharp EL-501W)Ĭaibler 2592 (purchased at CVS, TI-30 XIIs clone, battery, cos^-1 mistakenly labeled con^-1)Ītiva A-36 (took a while for it to wake up) Halo HLC-1 Lighting Calculator (deals with ceiling light fixtures) Radio Shack EC-4026 (clone of Casio fx-4500p)Ĭalculated Industries ProjectCalc Plus 8525 (1 yellow, 1 white)Ĭalculated Industries Construction Master 5 (I think I have 2?)Ĭalculated Industries Material Estimator 4019Ĭalculated Industries Machinist Calc Pro 4087 Radio Shack EC-4004 (clone of Casio fx-36P?) SL-100L (folding basic calculator, I have 2, 1 is at work)ĬFX-9850G (won this as a door prize at HHC)ĮL-516T (bought this at my university last year, 2010s design)ĮL-9600c (graphing calculator with stylus)ĮL-W516 (display is starting to deteriorate for lack of a better word) TI-58C (attached to a printer PC 100 I think, now lives the garage)įx-CG 10 (USA model, it's the 20 outside the USA)įx-115ES Plus (2, USA model, 1 gray keyboard, 1 black keyboard, like the black one better)įx-260 Solar II (I had this calculator with me during the Solar Eclipse on )ĬM-100 (similar to the HP 16C minus the programming, but it is solar, in its original box) TI-83 Plus (bought in a pawn shop in Atascadero, CA) TI nSpire CX CAS (hardly use this anymore) HP 28C (I'm afraid to touch the battery case because it seems it's stuck)īA II Plus (1990s keyboard, 2010s keyboard)īA II Plus Professional (1 black keyboard, 1 gray keyboard the gray keyboard is a PAIN to operate) ![]() HP 48G (one of my dogs thought it was a chew toy) HP 12C Platinum (my dad's favorite calculator, has the magnetic case) HP 12C (1 from the 2000s, fast chip, 1 from the original 1982 run) HP Prime (Hardware C, love the better colors on the keys!) See followup message, seperate posting, on a revision level question.This is what I have (I have over 100, my apologizes if I forget a few.): Thanks for the responses on the battery type. In response to message #5 by Thomas Okken Message #6 Posted by John Horak on, 10:21 a.m., I never had an HP-42S lose memory when I changed the batteries - this is with 3 different machines, including my current one (1993 model, rev. In response to message #4 by Karl Schneider Message #5 Posted by Thomas Okken on, 7:22 a.m., ![]() I also have a newer design 42S from 1992 whose batteries I haven't yet changed. My older-design 42S from 1989 recently survived a battery change with memory contents intact. HP-42S have a problem of not retaining the contents of memory during battery changes - maybe a bad batch of capacitors was used, I don't know. Silver oxide lasts longer but costs more. They are interchangeable, but it's best to use the same chemistry (alkaline or silver oxide). Luiz and John Limpert have given more details, but the simple answer is, three of any type 44, 76, or 357 cells. Message #4 Posted by Karl Schneider on, 3:28 a.m., Re: HP 42S - Battery Type and Constant Memory It's a silver oxide battery (lasts longer) and it has received good reviews. Message #3 Posted by John Limpert on, 2:24 a.m., Maybe some of these do not even exist, and even better models are available. In fact, these references are taken from the original HP15C Owner's Handbook, dated February 1984. For a higher current consumption (in case you plain to use the printer output constantly) you can try the Silver Oxide models: Eveready/UCAR 357, RAY-O-VAC RW42 OR 62, Duracell MS76, or others. They are the same as the National/Panasonic LR44, Eveready/UCAR A76 OR RAY-O-VAC RW82 all alkaline. You can use the same ones designed fot the Voyagers (HP10C to HP16C). What kind of batteries does the HP42S use? The owners manual just says it uses 3 button batteries, and the 42S I recently acquired came without batteries, and I want to make sure I get the right kind. Message #1 Posted by John Horak on, 12:53 a.m. HP 42S Battery Type The Museum of HP Calculators ![]()
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