Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!umich!samsung!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: The A3000 and the non-custom chips
Message-ID: <11283@cbmvax.commodore.com>
Date: 3 May 90 16:48:52 GMT
References: <11577@netcom.UUCP>
Reply-To: daveh@cbmvax (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 22

In article <11577@netcom.UUCP> mcmahan@netcom.UUCP (Dave Mc Mahan) writes:
>Now that the A3000 is upon us, can anyone tell me what the E-clock rate is?
>Also, is that the signal being fed to the CIA chips to provide clock pulses,
>or is the CIA chip clock something else again?

The E clock rate is the same, mainly for compatibility reasons.  The E clock,
such as it is, remains part of the expansion bus specification as well.  The
CIA chips can use the E clock as the timebase for some of their counters, 
though each gets fed an alternate timebase as well; one gets the horizontal
sync line, the other gets the 50Hz/60Hz line frequency.

There are no longer actual signals corresponding to the 68000 /VPA or /VMA
lines anywhere in the 3000; the CIAs are driven directly by the Fat Gary
chip.

>  -dave


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	"I have been given the freedom to do as I see fit" -REM