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From: gmv@cbuxc.UUCP (Mike Vrbanac)
Newsgroups: net.micro.att
Subject: RE: Re: help with 6300 memory expansion
Message-ID: <374@cbuxc.UUCP>
Date: Wed, 12-Feb-86 21:09:49 EST
Article-I.D.: cbuxc.374
Posted: Wed Feb 12 21:09:49 1986
Date-Received: Fri, 14-Feb-86 02:39:33 EST
References: <146000002@uiucuxc> <6700003@>
Organization: AT&T Bell Laboratories - Columbus Comp. Center
Lines: 28

> I found out today that if you add a third party hard drive to a 
> 6300 (on the 8-bit bus) the cpu slowes down to the speed of an IBM PC

Not exactly.  The 8-bit bus converter in the 6300 (I'm not sure about the PLUS)
runs at a 4mhz clock rate. The IBM PC is 4.77 mhz. The 6300 cpu still runs
at 8mhz.  Note that the 6300s with factory equipped hardisks have 8-bit bus
controllers so all the hardisks in the 6300 run at that speed. This is why
the benchmarks in the press show the 6300 to be slightly slower than the
IBM when doing disk i/o intensive stuff. (All the factory 6300 hardisk
controllers I've seen are DTC 5150s).

> you can replace the memory on the mother board which is fine. and the
> other has 256K on the mother and you can't change that. The one that you
> can't you have 2 options. 1 buy an AT&T 6300 card that has the 2 connectors
> on (for the 16-bit bus) and have the 6300 run like a bat out of h**l or,
> buy a AST 6-Pack or something like that and have the PC run like an IBMPC when
Close again. The missing element is that a 6300 with all the memory on the
motherboard runs with no memory wait states.  When it accesses memory on an
add-on board in a 16-bit bus slot, it needs a wait state.  8-bit bus memory
expansion would be much slower, as the author notes.

-- 

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 | Mike Vrbanac | AT&T Bell Laboratories | Columbus, Ahiya |
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