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From: conte@uicsrd.csrd.uiuc.edu
Newsgroups: comp.sys.hp
Subject: Re: Speeding up the HP28C
Message-ID: <44700009@uicsrd.csrd.uiuc.edu>
Date: 6 Feb 88 23:10:00 GMT
References: <4374@watdcsu.waterloo.edu>
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Nf-ID: #R:watdcsu.waterloo.edu:4374:uicsrd.csrd.uiuc.edu:44700009:000:1368
Nf-From: uicsrd.csrd.uiuc.edu!conte    Feb  6 17:10:00 1988


> /* Written 11:21 am  Feb  3, 1988 by bmaraldo@watdcsu.waterloo.edu in uicsrd.csrd.uiuc.edu:comp.sys.hp */
>
>  I recieved a preliminary copy of Dr. WAC Mier-Jedrzejowicz book,
>  'Customize Your HP-28C'.  It is excellent and I suggest it to anyone who
>  owns a 28C.  In it, he describes how to speed-up the 28C by changing two
>  capacitors.  The speed increase is bout 180%.  This makes a big
>  difference on all operations.  Happily, the clock and beeper functions
>  are unaffected as they are controlled by a quartz clock.

`Clock functions?'  What clock functions?  I know that the 18C has a
clock, and the two machines (18C and 28C) have the same processor (actually
from the 71B). [This from an issue last summer of HP Journal]  However,
I had thought the clock was not accessable in the 28C.

The 28S's have started shipping.  The machine seems faster than the 28C,
especially when plotting.  Just eyeballing it I would say that 180% increase
over the 28C is a reasonable description of the 28S's performance, so HP
might have also incorporated this fix into the `S.


Tom Conte      Center for Supercomputing Research & Development
               University of Illinois
The opinions expressed are my own, just mine, not the Center's, not Cedar's...
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