Path: utzoo!utgpu!water!watmath!watdcsu!bmaraldo
From: bmaraldo@watdcsu.waterloo.edu (Commander Brett Maraldo)
Newsgroups: comp.sys.hp
Subject: Re: Speeding up the HP28C
Message-ID: <4393@watdcsu.waterloo.edu>
Date: 10 Feb 88 06:09:26 GMT
References: <4374@watdcsu.waterloo.edu> <44700011@uicsrd.csrd.uiuc.edu>
Reply-To: bmaraldo@watdcsu.waterloo.edu (Commander Brett Maraldo)
Organization: Unit 36 Research
Lines: 22

In article <44700011@uicsrd.csrd.uiuc.edu> conte@uicsrd.csrd.uiuc.edu writes:
>Just a clarification: I'm asking if there is a real-time clock, I know
>there has to be a system clock.  However, implying that the speedup
>doesn't alter the `clock' suggests this isn't the system clock you're
>talking about.


   The CPU uses an LC time base as a clock while everything else uses a 
crystal controlled ocs.  The mod to increase the speed of the CPU clock
does not affect the Xtal clock.  This means the beeper & real time clock  
(#123 SYSEVAL) are unaffected.  The printer I/O uses the CPU clock for
sync so the speed upgrade will make the printer port useless on the 
HP printer.

				Brett L Maraldo


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