Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!mips!apple!dan
From: dan@Apple.COM (Dan Allen)
Newsgroups: comp.sys.handhelds
Subject: Re: HP-48 Comparison Test
Keywords: HP-48SX, calculators, portable computers, handhelds, HP
Message-ID: <39409@apple.Apple.COM>
Date: 12 Mar 90 03:48:00 GMT
References: <39230@apple.Apple.COM> <326@cbnewsb.ATT.COM>
Distribution: comp.sys.handhelds,comp.sys.hp
Organization: Apple Computer Inc, Cupertino, CA
Lines: 16

In article <326@cbnewsb.ATT.COM> neal@druhi.ATT.COM writes:
>What was the "EXACT" feature of the 75C/71B?

The EXACT command was used once the time was set exactly.  Then, a few
weeks later, the time could be set again, and EXACT would be executed a
second time.  Upon the second execution of EXACT, the 71/75 would
determine the clock's drift and automatically calibrate a correction
facter which was automatically applied thereafter.  After a few EXACTs
you could get a 71/75 VERY VERY accurate.  It was a wonderful feature
which could somehow probably be retrofitted to the 48SX by having a
global variable that maintained exact info, and then a repeating EXEC
alarm could be run daily which would use the programmable clock set
feature to adjust the time.

Dan Allen
Apple Computer