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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