Re: HP-41 internal upgrade. ???? Message #1 Posted by Andreas Müller(GER) on 13 Jan 2003, 6:18 p.m.
Hi Daniel,
what can be seen on the picture you linked to is in deed a Speedup circuit. The speed is switched up or down by a combination of two keys. I assume 'User and Alpha' or 'User and Prgm'.
The unit you have was AFAIK never produced commercially.
Regards, Andreas
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