Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!ogicse!cs.uoregon.edu!mips!sjsca4!poffen
From: poffen@sj.ate.slb.com (Russ Poffenberger)
Newsgroups: comp.sys.ibm.pc
Subject: Re: SCSI & MFM ???  HELP...!
Message-ID: <1990Jun12.173851.26209@sj.ate.slb.com>
Date: 12 Jun 90 17:38:51 GMT
References: <15000@agate.berkeley.edu> <31300002@adaptex>
Reply-To: poffen@sj.ate.slb.com (Russ Poffenberger)
Organization: Schlumberger Technologies, San Jose, CA.
Lines: 38

In article <31300002@adaptex> neese@adaptex.UUCP writes:
>
>>/* ---------- "SCSI & MFM ???  HELP...!" ---------- */
>>I have a dilemma here, and need help...
>>
>>Someone, in a previous posting, said that it may be possible to use SCSI
>>drives with MFM?  I was wondering if this is possible...
>>

[ stuff deleted]

>
>Okay, here is a definative answer,....  The AHA-154x adapter family has been
>designed so that it would co-exist with another standard hard disk controller
>in the system.  The 154x adapter becomes the slave controller and allows the
>standard hard disk controller to be the boot device.  No magic involved.  It
>just works that way.
>
>			Roy Neese
>			Adaptec Senior SCSI Applications Engineer
>			UUCP @  uunet!swbatl!texbell!
>				  {cpe,merch,nominil}!adaptex!neese
>				uunet!mlite!adaptex!neese


I just installed an adaptec 1542b SCSI controller. I haven't tried it with my
exisiting MFM controller, but alone so far, the thing is REALLY nice. It is
FAST. I get >700Kbytes/sec out of it. (CDC Wren III disk). A couple of programs
for measuring disk performance (coretest) don't work completely right. (ie it
can measure access time, but not transfer rate, and hdtest can measure transfer
rates, but not mess with the interleave, which probably makes sense), but this
can probably be expected.


Russ Poffenberger               DOMAIN: poffen@sj.ate.slb.com
Schlumberger Technologies       UUCP:   {uunet,decwrl,amdahl}!sjsca4!poffen
1601 Technology Drive		CIS:	72401,276
San Jose, Ca. 95110             (408)437-5254