HP 25 bugs, any details ?
#1

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.

#2

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.

#3

#4

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.

#5

BTW, The bug lies in the ROM0/anode driver chip under the display module...



Possibly Related Threads…
Thread Author Replies Views Last Post
  Strange HP 25 Problem (Repair) Onur Ilkorur 5 2,799 12-06-2013, 05:13 PM
Last Post: Onur Ilkorur
  HP-25 Wayne Selway 1 1,209 11-22-2013, 12:58 PM
Last Post: Michael de Estrada
  Digging for bugs Stefan Dröge (Germany) 2 1,485 11-13-2013, 04:39 PM
Last Post: Stefan Dröge (Germany)
  [HP-Prime] Simple Game (Bugs) CompSystems 1 1,398 11-01-2013, 10:18 AM
Last Post: Han
  HP-35s Cos[x] and Tan[x] bugs resolved? Thomas Windisch 2 1,483 10-31-2013, 01:12 PM
Last Post: Dieter
  RPN bugs both present in Prime Calc and emulator Eelco Rouw 9 2,690 10-16-2013, 12:22 PM
Last Post: Eelco Rouw
  Interesting Base Conversions - Porting a 1975 HP 25 Program to the HP 35S Eddie W. Shore 1 1,314 10-13-2013, 07:49 PM
Last Post: BruceH
  [HP-Prime] AND, OR BUGs? CompSystems 0 902 10-04-2013, 04:03 PM
Last Post: CompSystems
  HP 50g: question about bugs Miguel Toro 2 1,386 09-26-2013, 01:27 PM
Last Post: Miguel Toro
  [HP-Prime xcas] operations with complex numbers + BUGs + Request CompSystems 9 3,358 09-08-2013, 10:40 PM
Last Post: CompSystems

Forum Jump: