HP Forum Archive 15

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HP-41 2x speed up? Message #1 Posted by Arne Helme on 2 May 2005, 12:10 p.m. I am looking for information on how to speed up the HP-41 calculators. I remember vaguely from the mid-eighties that the procedure was to replace one of the resistors on the CPU board and thereby increasing its speed by a factor 2. Information or a reference to where I can find more details will be appreciated. Thanks, -- Arne

Re: HP-41 2x speed up? Message #2 Posted by Peter on 2 May 2005, 1:16 p.m., in response to message #1 by Arne Helme I beleive there was a recent thread here, just a few month back. Cheers Peter (1234)

Re: HP-41 2x speed up? Message #3 Posted by Garth Wilson on 2 May 2005, 3:23 p.m., in response to message #2 by Peter Peter said, "I beleive there was a recent thread here, just a few months back." A few months? The last post of the last time this thread came around was three days ago. http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi?read=72269

Re: HP-41 2x speed up?SO SAD!!! Message #4 Posted by PHILIPPE on 3 May 2005, 4:02 p.m., in response to message #1 by Arne Helme Well Peter, I see that you already forgot our discussion of last week :.( Fortunately, Garth is there to refresh our memories..... You proposed to send me some pictures and I will be happy to have a look on it (as well Arne probably). Kind regards, Philippe

Re: HP-41 2x speed up?SO SAD!!! Message #5 Posted by Peter on 3 May 2005, 9:36 p.m., in response to message #4 by PHILIPPE Hi, Sorry, I did not forget, just was out of the country... Here is a link to pictures of various CV and C boards as well as one halvenut board (Thanks Diego!!) with the timing capacitor marked. Link to C/CV boards Let me know if there are any problems in viewing the pictures. Happy speeding! Cheers Peter (1234) Edited: 3 May 2005, 9:40 p.m.

Re: HP-41 2x speed up?SO SAD!!! Message #6 Posted by PHILIPPE on 4 May 2005, 2:40 a.m., in response to message #5 by Peter Peter, Many thanks for theses nice pictures!!!! Diego, I really appreciate as well your mail with the informations on the halfnut. Cheers Philippe

Re: HP-41 2x speed up?SO SAD!!! Message #7 Posted by Arne Helme on 4 May 2005, 6:55 a.m., in response to message #4 by PHILIPPE Thanks for the reference to the photos, Peter! Exactly what I was looking for! -- Arne

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