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From: mike@cimcor.mn.org (Michael Grenier)
Newsgroups: comp.periphs.scsi
Subject: Re: Scsi Controllers
Message-ID: <1991Feb11.122331.8914@cimcor.mn.org>
Date: 11 Feb 91 12:23:31 GMT
References: <1991Feb09.052143.1873@bang.uucp>
Distribution: na
Organization: Scandia Microsystems
Lines: 26

From article <1991Feb09.052143.1873@bang.uucp>, by iverson@bang.uucp (Tim Iverson):
> board had a phenomenal transfer rate.  Well, I checked it under DOS with
> CoreTest and a wimpy little seagate capable of at most 200KB/s.
> 
> Surprise, CoreTest came back with 1.2MB/s!  This is flatly impossible, they
> must have been doing something fishy.

We've also acheived those rates under UNIX. (Strange how this discussion keeps
reappearing...)
 
>  So, I dusted off soft-ice and
> observed their BIOS firsthand.  Aha!  Caught in the act - they disable
> *all* interrupts while transferring data.  This means the clock doesn't tick,
> which means (to CoreTest) that transfers take no time at all.
> 

That's not the case under UNIX.

> For unix, you will not be able to live
> without a 1542, not unless you really know what you're doing.

BullSh*t

     -Mike Grenier
      mike@cimcor.mn.org