Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!portal!cup.portal.com!jpser
From: jpser@cup.portal.com (John Paul Serafin)
Newsgroups: comp.sys.handhelds
Subject: Re: HP95C (was Re: List of All HP Calculators)
Message-ID: <41566@cup.portal.com>
Date: 23 Apr 91 02:41:29 GMT
References: <51394@apple.Apple.COM> <41259@cup.portal.com>
  <28116797:2733.7comp.sys.handhelds;1@hpcvbbs.UUCP> <51829@apple.Apple.COM>
Organization: The Portal System (TM)
Lines: 20

dan@Apple.COM (Dan Allen) writes:
>Early HP-35s also had a bug when dealing with the Sqrt(2.02) if my
>memory serves me right.  (I know the number was 2.02 -- I just don't
>remember the operation for sure.)  Anyway, those early HP-35s with this
>bug are QUITE RARE, as most owners opted to get the free upgrade to a
>newer ROM that corrected the bug.
>
>Dan Allen
>Soon to be owner of the latest HP, the HP-95LX
The early HP-35 bug was the incorrect exponention of the natural log
of 2.02; the HP-35 calculated the log of 2.02 correct to 10 digits,
but exp of that number returned 2.0
There were also some very obscure trig bugs involving some very
unlikely arguments.   I would certainly be interest in the story of
how those were found.
As to having bugs fixed, I wonder how many people are still clinging
to the "good" bugs in their early HP-41's.   The existance of those
features arguably had a profound effect on the evolution of HP handhelds.
John Serafin
jpser@cup.portal.com