OT: A question about the Sharp EL-8131 Marcel Samek Member Posts: 189 Threads: 39 Joined: Nov 2011 02-12-2013, 12:13 AM I have a question about this ultra simple calculator and was hoping that someone might enlighten me. (Apologies for being just a bit off topic.) In the manual, in the section on the calculator's "Operations", it begins like this: ----------Quote---------- ``` Before calculation * To obtain an accurate result, be sure to perform the following operation before starting calculation. Power switch "ON" -> 0 1.1111111 x= -> 1.2345678 ``` ----------End Quote------------- I am very curious as to why they recommend that one performs that multiply. What could the consequences of not performing it be? Eric Smith Posting Freak Posts: 2,309 Threads: 116 Joined: Jun 2005 02-12-2013, 12:19 AM Maybe they think it's a way for you to tell whether the batteries are too low for it to do calculations properly? It's obviously an easy calculation to enter, though it doesn't really test things very thoroughly because there is no carry when adding the partial products. Marcel Samek Member Posts: 189 Threads: 39 Joined: Nov 2011 02-12-2013, 12:26 AM That makes sense. I kept thinking that it might have to do with resetting/initializing the state of the calculator somehow, but that did not make sense right after a power-on. It did not occur to me that it might just be a test. Although, if it is meant to be a test, I am a little surprised that they didn't put some statement in the manual as to what to do if one sees the wrong result... Dieter Senior Member Posts: 653 Threads: 26 Joined: Aug 2010 02-12-2013, 02:41 PM While I do not know anything about the accuracy of this calculator, I wonder why 1,1111111 squared should return 1,2345678. The true result is 1,23456787654321 which rounds to 1,2345679 on an eight-digit machine. Dieter Didier Lachieze Member Posts: 248 Threads: 5 Joined: Feb 2008 02-12-2013, 05:20 PM Tested on a few vintage calculators: On the Sharp EL-811 and on the Sharp EL-814: 1.1111111 [x] [+=] gives 1.2345678 Same on the Rockwell 63R, however on the Sharp EL-5803 it gives: 1.2345679 Eric Smith Posting Freak Posts: 2,309 Threads: 116 Joined: Jun 2005 02-12-2013, 05:33 PM Hurl it at the nearest wall? Possibly the engineers weren't confident in the power-on reset, and expected that if you did a simple calculation like that and didn't get the right answer, that you would turn it off then on again. [insert "IT Crowd" reference here]. Marcel Samek Member Posts: 189 Threads: 39 Joined: Nov 2011 02-12-2013, 10:41 PM I assume that to correctly calculate the last digit, the calculator must internally have one more digit of precision than it displays. I had never heard of the EL-5803 before. It seems like an odd calculator from the very little info I can find on on the web. This is the only picture I could find: http://tinyurl.com/a7udsx3 Didier Lachieze Member Posts: 248 Threads: 5 Joined: Feb 2008 02-12-2013, 11:26 PM Quote:I had never heard of the EL-5803 before. It seems like an odd calculator from the very little info I can find on on the web. This is the only picture I could find: http://tinyurl.com/a7udsx3 This is mine :-) Marcel Samek Member Posts: 189 Threads: 39 Joined: Nov 2011 02-12-2013, 11:36 PM Well, it seems like you have a rarity. Do you know if it was built for some specific audience? Or how many were made? hpnut Senior Member Posts: 408 Threads: 45 Joined: Oct 2007 02-12-2013, 11:57 PM Interesting, it has (shifted) functions for frequency (Hz) and decibels (dB). Didier Lachieze Member Posts: 248 Threads: 5 Joined: Feb 2008 02-13-2013, 12:22 AM I don't know how many were made. I think that the targeted audience was electrical engineers: it was build to simplify calculations of impedance, decibels and angular frequency. It has also dedicated keys for units: pico, nano, micro, milli, kilo, Mega and Giga, and can do operations on complex numbers using the keys [R.P] and [I.P] (real part & imaginary part). It's from 1977. It's listed in this article: Popular Science June 1977: Specialized Calculators shortcut tough problems Edited: 13 Feb 2013, 12:34 a.m. Massimo Gnerucci (Italy) Posting Freak Posts: 882 Threads: 23 Joined: Jan 2005 02-13-2013, 03:10 PM Here is the manual. « Next Oldest | Next Newest »

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