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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!spool.mu.edu!darwin.sura.net!convex!egsner!adaptex!adapcal!jlloyd
- From: jlloyd@adapcal.UUCP (John Lloyd)
- Subject: Re: Adaptec AHA-1542B and large SCSI questions
- Organization: Adaptec Inc., California
- Date: Mon, 28 Dec 1992 20:01:11 GMT
- Message-ID: <1992Dec28.200111.16696@adapcal.UUCP>
- References: <1992Dec12.174722.407@weyrich.UUCP> <1992Dec14.234840.2630@mksol.dseg.ti.com> <1992Dec21.023248.9417@weyrich.UUCP>
- Lines: 52
-
- In article <1992Dec21.023248.9417@weyrich.UUCP> uunet.uu.net!weyrich!orville writes:
- >In article <1992Dec14.234840.2630@mksol.dseg.ti.com> mccall@mksol.dseg.ti.com (fred j mccall 575-3539) writes:
- >>In <1992Dec12.174722.407@weyrich.UUCP> orville%weyrich@uunet.uu.net (Orville R. Weyrich) writes:
- >>
- >>>I tried to use the Adaptec BBS and couldn't get through, so maybe the
- >>>net can help....
- >>
- >>>I got an Adaptec AHA-1542B controller and want to use it with OS/2 2.0
- >>>and a large SCSI disk.
- >
- >Specifically, a Maxtor P1-17S 1.5 Gig Panther.
- >
- >>>My question is this: I have heard that SCSI disks larger than 1 Gb may
- >>>not work properly without BIOS upgrades or special drivers. Is this true for
- >>>OS/2?
- >
- >>I don't know if this is a problem for OS/2 or not, but if it is there
- >>is no fix for it. The Adaptec PROM upgrade is for DOS ONLY. The
- >>drivers for OS/2 make assumptions about the head/platter translation
- >>that the Adaptec controller is doing that would break if you updated
- >>the PROMs.
- >
- This is NOT true. Our drivers will work with either the new extended BIOS
- translation or without it. When you install OS/2 2.0 you must load our
- driver instead of IBMINT13.I13 or you will not see the whole drive. I
- would also recommend that you use a driver later than GA. The current
- limitation (IBM's) is that the boot partition must not have more than
- 1024 cylinders. Thus if your drive is > 1GB and you do not have the new
- BIOS you must break the drive up to into at least two partitions. IBM
- may be working on a fix for this limitation but I don't know when it
- will be available.
-
- >I have been banging my head against a brick wall for the past two days trying
- >to get the Adaptec 1542B and the Maxtor P1-17S to work together.
- >
- >What I have been trying to do is to set up boot manager for DOS 5.0,
- >Xenix, OS/2 2.0, and OS/2 beta. I wanted to keep my two MFM drives as well as
- >the new Maxtor SCSI drive. With one MFM drive installed and using the
- >FD controller on the MFM WD-clone controller, and with the FD controller on
- >the Adaptec SCSI drive disabled, I was able to get the OS/2 FDISK on the
- >installation program to partition both the MFM and SCSI drive to use the
- >disk manager (putting DOS and Xenix partions on my MFM drive and OS/2
- >partitions on the SCSI drive).
- >
- >The first problem is that I lost 33% of my SCSI drive -- FDISK only sees
- >the first 1 Gig of the 1.5 Gig formatted capacity.
- >
- Modify a copy of disk #1 and add our driver to CONFIG.SYS. Add the line
- BASEDEV=AHA154X.ADD and then copy the driver on to the copy of Disk #1.
- You should be able to see the whole drive.
-
- jlloyd@adapcal.com
-