HP Forum Archive 14

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HP 25 bugs, any details ? Message #1 Posted by Pascal on 13 Mar 2004, 6:15 a.m. I read on the Bug section of the site that some hp-25 had bugs. I quote : "Some HP-25s have several bugs including polar/rectangular conversion errors for angles within +/- 0.000573° of 180° . Also when the last operation caused data in a certain range to be stored in a register and the calculator was at step 00, switching to Program mode would cause a blank display and switching back to Run would display Error." Does anyone have more details on that and an example of a computations that shows those bugs with the correct result and the wrong one ? I have 2 HP-25 and I would like to know if they have bugs. Thanks for your help. Pascal.

Re: HP 25 bugs, any details ? Message #2 Posted by David Smith on 13 Mar 2004, 1:09 p.m., in response to message #1 by Pascal Do any trig operation with a small range (I use 1E-14 TAN) then switch to PROGRAM mode. See a blank display. Switch to RUN, see ERROR.

It does not do anything with mine :-( (No text) Message #3 Posted by Michel Beaulieu on 13 Mar 2004, 6:14 p.m., in response to message #2 by David Smith

Mine has a bug ! Message #4 Posted by Pascal on 14 Mar 2004, 4:11 a.m., in response to message #2 by David Smith Thanks, I was able to test on my 2 hp-25 and one of them has this bug. Its serial number is 1510, which is just 2 weeks later than the first dated on hpmuseum site (1508). Anything about the other bug ? Edited: 14 Mar 2004, 2:58 p.m.

Re: Mine has a bug ! Message #5 Posted by David Smith on 14 Mar 2004, 5:07 p.m., in response to message #4 by Pascal BTW, The bug lies in the ROM0/anode driver chip under the display module...

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