Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!west!male!texsun!letni!utacfd!merch!cpe!adaptex!adaptx1!neese
From: neese@adaptx1.UUCP
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Adaptec AHA1542B max bus speed
Message-ID: <284500010@adaptx1>
Date: 8 Jan 91 13:54:44 GMT
References: <1103@applix.com>
Lines: 21
Nf-ID: #R:applix.com:1103:adaptx1:284500010:000:874
Nf-From: adaptx1.UUCP!neese    Jan  7 09:58:00 1991


>/* ---------- "Adaptec AHA1542B max bus speed" ---------- */
>I couldn't get an answer from Adaptec tech. or any local distributors,
>and no one's calling me back, so I ask you- what's the max bus speed
>rating for the 1542B?

The 154x adapter has the ability to move data across the AT bus at up
to 10MBytes/sec, but so far no one has built an AT that can allow true
10MB/sec data rates.  The card may work at this setting in some systems
but is actually slowed down by the IOCHRDY signal.  This signal is
implemented on the motherboard and very differently from manufacturer
to manufacturer.
There is also no jumper on the adapter for this speed setting, but can be
done via software.

			Roy Neese
			Adaptec Senior SCSI Applications Engineer
			UUCP @  neese@adaptex
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