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From: George Neuner <gneuner2@comcast.net>
Newsgroups: comp.arch
Subject: Re: Is Parallel Programming Hard, And, If So, What Can You Do About It?
Date: Wed, 21 May 2025 22:19:50 -0400
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On Wed, 21 May 2025 15:06:27 -0400, EricP
<ThatWouldBeTelling@thevillage.com> wrote:

>Anton Ertl wrote:
>> EricP <ThatWouldBeTelling@thevillage.com> writes:

>>> When I installed WinNT 3.1 (beta) in 1992 it came with explicit
>>> instructions that HDD must use write-through caching, which was
>>> enabled/disabled by a jumper pin on the drive.
>> 
>> SCSI or PATA?
>> 
>> - anton
>
>IIRC it needed a SCSI board for the CD-ROM drive (I don't remember why,
>I just remember being miffed that I had to buy one) but could use IDE HDD.
>As the SCSI HDD were the same drives but with a SCSI interface were
>$100 more expensive, I would have used the IDE.
>
>WinNT was developed on MIPS R4000 and ported to 80386/486 later.
>Those MIPS systems used all SCSI so maybe they hadn't had time to port
>the CD-ROM drivers to IDE but had ported the HDD drivers to IDE
>before the beta release.

I think the problem went back farther than that.  I recall CD drives
[and printers also] running on PC-DOS/MS-DOS in the late 80s using
some kind of lobotomized SCSI controllers that would /not/ also work
for SCSI HDDs.