Internet Tools (InfoMagic)/Internet Tools.iso/dos_win/winsock/maillist/94-05.Z/94-05/[e-mail]_Tue May 13 17:52:01 1994.msg

Internet Message Format | 1994-05-31 | 4KB

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Date: 13 May 1994 17:52:01 GMT
From: [e-mail] (A. Ross Keele)
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Subject: one more test (sorry!)

Testing last time.

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A. Ross Keele                                           [e-mail]
Dept. of Psychology                                             [phone]
University of Saskatchewan                       Saskatoon, SK CANADA S7N 0W0
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From [e-mail] Fri May 13 18:07:27 1994
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From: John Susag <[e-mail]>
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Subject: Re: 32 bit access with SCSI no available. Hunh? was Re: Win Mosaic alpha 4 (my fix)

>In article <[e-mail]> David Arnstein writes:
>In article <[e-mail]>,
>Antti Tirronen <[e-mail]> wrote:
>>When I had both IDE and SCSI disks installed, I had windows on the IDE disk
>>and it was happy (and faster) with its 32-bit mode. I haven't yet taken the
>>time to try to figure out how to get that back, now that I got rid of the IDE
>>in favor of an all out SCSI system.
>
>You've discovered the annoying fact that under Windows 3.1 and WFWG 3.11, SCSI
>disk I/O is SLOW, SLOW, SLOW.  This is because Windows 3.1 won't do 32-bit disk
>access for (almost all) SCSI host adapters.
>
>As a result, each time SCSI I/O occurs, Windows must switch from 32-bit
>protected mode to real mode, and run code out of your SCSI host adapters ROM
>BIOS.  Doubly slow!
>
>If you had 32-bit disk access going, Windows would run the code (32-bit disk
>access driver) in protected mode, without touching your SCSI BIOS.
>
>Only Future Domain host adapters are supplied with a driver that permits 32-bit
>disk access from Windows.  This driver does not work with WFWG 3.11 and
>besides, if you do use this driver, you may have to disable 32-bit disk access
>for your IDE drive(s).
>
>Windows 3.1 users:
>
>    ***   J U S T    S A Y    N O    T O    S C S I   ***
>--
>David Arnstein       |          What do you mean, "get a life"?
>[e-mail]  |          This *is* my life!>

Interesting.  Yes, 32-bit disk access replaces the real mode ROM BIOS with a 32
bit protected mode version.  Microsoft only supplied a driver for the Western
Digital 1003 controller, a standard which lots of controllers emulate, including
MOST IDE.  No all though, cause I've got a system with a old Seagate 42 MB which
doesn't support it and a Plus Hardcard 50Z which also doesn't support it,
although Quantum supplies a driver for it. So that's one IDE drive which needed
a driver.

On the SCSI question, yes most SCSI controllers do not emulate the WD1003.  The
SCSI controller driver would need to write a driver.  I once had a Future Domain
which did and worked great with Windows 3.0 FastDisk 32 bit disk access.
However, I now am running on an NCR 3350 desktop with an NCR 53C94 SCSI
controller and both 32 bit file and disk access work great!



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