The Museum of HP Calculators

HP Forum Archive 21

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HP-35 ('72) Bug Fixes & Variations
Message #1 Posted by Matt Agajanian on 18 Apr 2012, 4:30 p.m.

Hello all.

During which body redesign did HP implement the ln(2.02) bug fix on the HP-35?

      
Re: HP-35 ('72) Bug Fixes & Variations
Message #2 Posted by Eric Smith on 18 Apr 2012, 8:07 p.m.,
in response to message #1 by Matt Agajanian

Firmware changes don't generally correlate well with mechanical changes.

      
It's a ROM issue.
Message #3 Posted by Frank Boehm (Germany) on 19 Apr 2012, 6:52 a.m.,
in response to message #1 by Matt Agajanian

US-made 35s with 1143-serial numbers (probably not all though) had the bug. If judging by the casing, I'd say it correlates more or less with the "raised dot" on the "5"-key". However a lot of calculators were sent back for service, the faulty ROMs were desoldered and replaced.


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