HP41 Turbo Modification

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HP41 Turbo Modification

Postby graythornWW » Thu Apr 30, 2009 6:47 am

Hi all, :lol:

does anybody know how to modify a HP-41cx to the turbo-version? I did it more than 10 years ago, but I forgot how I did it. :(

All I know is, that I needed a little switch an a little capacitor for the modification.

thanks for your help
Andreas
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Re: HP41 Turbo Modification

Postby jotne » Thu Apr 30, 2009 9:24 pm

I did it for some of customer back in 1986/86, but I do not remember of it was done.
You need to change a capacitor to one with a smaller one. This can give your up to double speed, but it will eat battery.

You need a dip switch that can switch between original capacitor and the one that gives more speed.
HP41CX with CCD module . HP41CV . HP42S + many other HP calculators
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Re: HP41 Turbo Modification

Postby wfurlow » Fri May 01, 2009 5:04 pm

I am sure the details are in the PPC archives somewhere. Some people used reed switches and even reed switches that toggle and stay set. It changes the tone frequency also.
Warren
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Re: HP41 Turbo Modification

Postby Olivier » Wed May 20, 2009 11:29 am

Bonjour,

I have a pdf file wich explain the mod in french.
I can give you if you want. Just send me a private mail with your e-mail adress.
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Re: HP41 Turbo Modification

Postby PoetikBiker » Mon Jul 23, 2012 12:53 am

Does the PPC-Archive still exist, and where can I find it?
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Re: HP41 Turbo Modification

Postby jotne » Mon Jul 23, 2012 5:26 am

HP41CX with CCD module . HP41CV . HP42S + many other HP calculators
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Re: HP41 Turbo Modification

Postby tomjackson » Mon Dec 03, 2012 9:30 am

I was looking for something that can switch between original capacitor and the one that gives more speed. But I got little information about that. Now from this thread, I know what hardware is needed for switching. Can anyone help me to find the resource for dip switch?

[Edited by moderator: unrelated spam link removed.]
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