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From: guzzi@uiucdcsb.CS.UIUC.EDU
Newsgroups: net.micro.att
Subject: Re: Hard Drive Slows Memory?
Message-ID: <144400003@uiucdcsb>
Date: Fri, 14-Feb-86 17:23:00 EST
Article-I.D.: uiucdcsb.144400003
Posted: Fri Feb 14 17:23:00 1986
Date-Received: Sun, 16-Feb-86 04:39:01 EST
References: <1166@homxa.UUCP>
Lines: 32
Nf-ID: #R:homxa.UUCP:1166:uiucdcsb:144400003:000:1198
Nf-From: uiucdcsb.CS.UIUC.EDU!guzzi    Feb 14 16:23:00 1986


>
>/* ---------- "Hard Drive Slows Memory?" ---------- */
>Someone named Brad writes
>
>> 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
>> while access that memory.  
>
>What exactly does this mean?  How could a hard drive (or anything else)
>slow down the cpu?  Should I worry?  (I have a 6300 with a third-party
>hard drive.) 
>
>Ken Bandes
>AT&T IS
>
>Disclaimer:  I'm not responsible for anyone's grammer but my own.

	I was also puzzled when I first read this.  I think you
sould substitute "memory expansion card" for "hard drive" in the above
message.  All expansion cards for the ibm pc use an 8 bit data bus while
the pc6300 uses a 16 bit data bus.  If you put in an 8 bit memory card,
then the 6300 will slow down to the speed of an ibm pc when accessing
memory on the 8 bit bus.  
		      --Mark Guzzi
			University of Illinois at Urbana-Champaign
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