Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!evax!utacfd!merch!cpe!adaptex!adaptx1!neese
From: neese@adaptx1.UUCP
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Adaptec AHA-1542a dual SCSI / FDC C
Message-ID: <284500019@adaptx1>
Date: 13 Mar 91 01:27:49 GMT
References: <2706@ttardis.UUCP>
Lines: 22
Nf-ID: #R:ttardis.UUCP:2706:adaptx1:284500019:000:858
Nf-From: adaptx1.UUCP!neese    Mar 12 09:09:00 1991


>/* ---------- "Adaptec AHA-1542a dual SCSI / FDC C" ---------- */
>
>I am experiencing a nusance problem which I do not know how to
>trouble shoot.
>
>Under DOS I can utilize the controller to read either low (DD) or
>high (HD) floppy disks. What I can't do is either read a DD, 
>remove it and replace it with a HD and read the HD (and converse).
>I have to reboot DOS in order to change floppy disk densities.
>
>Is this a controller problem, a floppy disk configuration problem,
>or an known characteristic of the usage of the dual controler.

This problem has appeared on variants of the AMI BIOS.  You can use
debug to write a 1 to location 40:8f and this will cure the problem.
I would make a batch file and put it into autoexec, so that it is done
at each power up.

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