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From: bill@hpcvlo.HP.COM (Bill Frolik)
Newsgroups: comp.sys.ibm.pc
Subject: Re: OMTI/SMS Controller
Message-ID: <1610042@hpcvlo.HP.COM>
Date: Fri, 9-Oct-87 13:28:47 EDT
Article-I.D.: hpcvlo.1610042
Posted: Fri Oct  9 13:28:47 1987
Date-Received: Tue, 13-Oct-87 06:19:08 EDT
References: <1634@epiwrl.EPI.COM>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 29


My SMS reference manual lists quite a few differences between the OMTI 5510
and the OMTI 5520.  Some of the biggies:

	- The 5520 card is shorter (4.95") than the 5510 (5.5").

	- The 5520 has an onboard drive power connecter (not found on 5510).

	- The 5520 fixes the number of bytes per sector at 512, with
	  17 sectors per track (for MFM drives).  Your 5510 has jumpers
	  (W9 and W10) that let you select from 512/18, 256/32, 512/17,
	  and 1024/9 bytes-per-sector/sectors-per-track.  Your 5510 also
	  lets you individually specify LUN 0 and LUN 1 as hard- or 
	  soft-sectored, and lets you specify the drive as fixed or
	  removable (which changes a number of other parameters as well.)

Card I/O base address and BIOS base address configuration are the same;
Buffer size, ECC length, and data transfer rates are also the same.
Controller command set is the same, and I would imagine BIOS command set
is also the same.

If I were you, I'd ask the folks at SMS (415-964-5700) if you can make
the replacement.  Looks like enough things are different that I'd be
skeptical about just dropping in a 5520 and expecting everything to work.

Bill Frolik
hp-pcd!bill
Hewlett-Packard Portable Computer Division
Corvallis, Oregon 97330