Re: Reading from the CMOS clock

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#206

From: Nick Smith
Date: Tue, 01 Sep 1992 16:45

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In article <1992Sep1.104148.12279@infodev.cam.ac.uk> nas20@cl.cam.ac.uk (Nick Smith) writes:
>I'm having a little trouble with some code I'm writing at the moment:
>
>For various essential reasons, I have to turn off interrupts for upto
>several minutes at a time. What I *want* to do, is preserve the real time
>clock (I know how long I will have interrupts disabled exactly)
>
Oh yeah, I have tried adding the time delay to the old clock value, then 
writing it, but the time-based SWIs are rather limiting - you can only read
the CMOS clock as BCD (precision 1 sec), and you can only write the CMOS
clock as a string, and while there is a SWI to convet BCD->string a) it has
insufficient precision, and b) it requires that you know how many days are there in each month, and worry about leap years, etc, etc - too much hassle !



--
Nick Smith, Churchill College, Cambridge, UK.  %$%  Email: nas20@uk.ac.cam.phx
sig quote wanted - must be under guarantee.   $%$  --- Usual disclaimer. ---

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From: nas20@cl.cam.ac.uk (Nick Smith)
Newsgroups: comp.sys.acorn.tech
Subject: Re: Reading from the CMOS clock
Message-ID: <1992Sep1.164514.15053@infodev.cam.ac.uk>
Date: 1 Sep 92 16:45:14 GMT
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