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From: jerry@gumby.Altos.COM (Jerry Gardner)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Adaptec AHA 1542B and QEMM 5.12 pro
Message-ID: <4907@gumby.Altos.COM>
Date: 29 May 91 18:04:43 GMT
References: <673956426@ds2> <284500023@adaptx1>
Reply-To: jerry@altos.COM (Jerry Gardner)
Organization: Altos Computer Systems, San Jose, CA
Lines: 26

>/* ---------- "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.




-- 
Jerry Gardner, NJ6A					Altos Computer Systems
UUCP: {sun|pyramid|sco|amdahl|uunet}!altos!jerry	2641 Orchard Parkway
Internet: jerry@altos.com				San Jose, CA  95134
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