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From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.arch
Subject: Re: IBM 370 TOD clock resolution
Message-ID: <5058@alice.uUCp>
Date: Fri, 28-Feb-86 17:16:07 EST
Article-I.D.: alice.5058
Posted: Fri Feb 28 17:16:07 1986
Date-Received: Sat, 1-Mar-86 17:45:56 EST
References: <561@hoptoad.uucp>
Organization: Bell Labs, Murray Hill
Lines: 9

> Before you call that a hack, see what the Amdahl 470 V/6 did.  It just
> delayed the STCK instruction until the clock ticked.  I believe the
> clock ticked every 52 cycles or something, so the STCK instruction had
> an "average" execution time of 26 clocks, depending when you tried versus
> when it last ticked.

That seems silly.  The low-order bit of the IBM TOD clock represents
one microsecond.  Surely you're not saying that the V/6 can execute
52 million STCK instructions per second?