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From: jnwester@immd4.informatik.uni-erlangen.de (Joern Westermann)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Adaptec AHA 1542B and QEMM 5.12 pro
Message-ID: <1991Jun1.203142.3521@informatik.uni-erlangen.de>
Date: 1 Jun 91 20:31:42 GMT
References: <673956426@ds2> <284500023@adaptx1> <4907@gumby.Altos.COM>
Organization: CSD., University of Erlangen, Germany
Lines: 33

jerry@gumby.Altos.COM (Jerry Gardner) writes:

>>/* ---------- "Adaptec AHA 1542B and QEMM 5.12 pro" ---------- */
>>
>>
>>Although Adaptec says in their documentation, that there are no problems
>>with QEMM from version 5.0 on, my system crashes again and again.
>>
>>My machine is a 33 Mhz 386 with a AHA 1542B SCSI controller.
>>
>>Especially HILOAD causes this problem quite often.


>I had this problem too until I started using the aspi4dos.sys driver that
>came with my 1542B.

>The problem is related to QEMM putting the 386 into virtual 8086 mode.
>CPU memory addresses may no longer map directly to the physical addresses
>that are used by the 1542B.  The Adaptec driver handles this correctly.

You can also use the QEMM option "diskbuf". "diskbuf=04" works fine on my
computer with Adaptec 1542B.
   Joern
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Joern Westermann                         |||||||||
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