Newsgroups: comp.arch
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: System clock rate vs. memory chip speed.
Message-ID: <1989Nov29.193200.7167@utzoo.uucp>
Organization: U of Toronto Zoology
References: <1989Nov28.222102.12113@agate.berkeley.edu> <8747@cbmvax.UUCP>
Date: Wed, 29 Nov 89 19:32:00 GMT

In article <8747@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes:
>In the old days (long ago, when things were 8 bit) we used to stretch the
>CPU clocks to add wait states, at least in 6502 systems.  On the 6502, one
>bus clock == one CPU clock, and so wait states were expensive if you
>really waited one whole CPU clock.

The old days weren't so long ago.  The Sun 3/180 (also 160 and 75, which
used the same CPU board) did the same thing with the 68020, so they could
run with 1.5 wait states instead of 2.
-- 
That's not a joke, that's      |     Henry Spencer at U of Toronto Zoology
NASA.  -Nick Szabo             | uunet!attcan!utzoo!henry henry@zoo.toronto.edu


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