Newsgroups: comp.os.os2.misc
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From: rommel@Informatik.TU-Muenchen.DE (Kai-Uwe Rommel)
Subject: Re: OS/2 with AT clone, Adaptec 1542B, and SCSI drive
Message-ID: <1991May13.090844.12795@Informatik.TU-Muenchen.DE>
Sender: news@Informatik.TU-Muenchen.DE
Organization: Technische Universitaet Muenchen, Germany
References: <2827F4F5.3E2E@tct.com> <1991May9.032806.26589@netcom.COM> <M1PHM02.91May11164513@mfsss1.fed.frb.gov>
Date: Mon, 13 May 1991 09:08:44 GMT
Lines: 39

In article <M1PHM02.91May11164513@mfsss1.fed.frb.gov> m1phm02@fed.frb.gov (Patrick H. McAllister) writes:
>In article <1991May9.032806.26589@netcom.COM> feustel@netcom.COM (David Feustel) writes:
>   OS/2 doesn't work with SCSI yet. Try again in a year.
>   -- 
>   David Feustel, 1930 Curdes Ave, Fort Wayne, IN 46805, (219) 482-9631
>   EMAIL: netcom.com
>I am continually surprised whenever I see this statement: I have OS/2 1.3
>running on my Northgate clone with an Adaptec 1542B SCSI host adapter with
>no problems. What doesn't work, I am told, is HPFS on a SCSI; I can't tell

There seems to be much confusion about SCSI support under OS/2. As far
as I know, OS/2 currently supports *IBM's* SCSI hardware. But SCSI host
adapters are not standardized and thus each of them requires a special
(different) driver for OS/2. Thus, many other SCSI adapters may not be
supported under OS/2. I saw Adaptec (for 1.1) and Future Domain (don't
know about version) advertizing OS/2 support for their SCSI adapters.

On the other side, several SCSI adapters, such as the 1542B from
Adaptec (am I right? I have read this) simulate a standard ST-506
controller on the register level for the first two SCSI drives. This
allows OS/2 to run on those adapters but it can only use the first two
drives (hard drives). I have not yet tested such a machine. But I cannot
imagine why OS/2 1.2/1.3 should not be able to use HPFS on such
controllers as it has no problems to use HPFS on real ST-506 controllers
or other controllers that emulate ST-506, like IDE adapters (I use an
IDE board with two drives and use HPFS).

I have heard too, that Nokia Data offers their OEM version of OS/2 with
driver for the Adaptec 1542A because they use this controller in their
machines. I got this information directly from a Nokia Data
representative here in Germany.

Kai Uwe Rommel

/* Kai Uwe Rommel, Munich ----- rommel@lan.informatik.tu-muenchen.dbp.de */

DOS ... is still a real mode only non-reentrant interrupt
handler, and always will be.                -Russell Williams

