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From: daveh@cbmvax.UUCP
Newsgroups: net.micro.amiga
Subject: Re: 50 Hz problem with CIA's TOD
Message-ID: <39@cbmvax.cbmvax.cbm.UUCP>
Date: Mon, 31-Mar-86 11:18:21 EST
Article-I.D.: cbmvax.39
Posted: Mon Mar 31 11:18:21 1986
Date-Received: Wed, 2-Apr-86 03:07:12 EST
References: <1635@caip.RUTGERS.EDU>
Reply-To: daveh@cbmvax.UUCP (Dave Haynie)
Organization: Commodore Technology, West Chester, PA
Lines: 14

In article <1635@caip.RUTGERS.EDU> #D2S%DDATHD21@WISCVM.WISC.EDU writes:
>People at Amiga (or was it Commodore ?) thought, it would be less
>expensive to use the AC-frq as the CIA's real time clock. OK, it works
>(not very precise, but it works - works with US-60 Hz.

I'm not sure how they do it with German 50Hz, but here in the USA all
60Hz lines are regulated.  Just about any clock that plugs into the
wall uses the 60Hz signal as its timebase.  They actually change the
frequency occasionally to insure that all the clocks using this featue
will stay in time.  Over long periods (if you keep you Amiga on all the
time, in other words) the 60Hz pulse from the AC line will be FAR more
accurate than any crystal clock.

-Dave Haynie                    daveh@cbmvax.UUCP