Emulex MD24 info/SCSI help?

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#1275

From: Simon Greaves
Date: Tue, 05 Jan 1993 16:05

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I'm desperately trying to get some disk attached to a Sun 3, I need some
info/help.

I have a Sun 3/60 that I want to connect to a disk tray I got from an
IBM PC RT setup. The tray has 4 EDSI drives which are connected to an
Emulex MD24/C which is connected to a Rancho RT-SDA, a differential to
single-ended SCSI converter.

I think the MD24 is essentially an MD21 with support for 4 EDSI drives 
rather than 2, and for differential SCSI rather than single-ended. I 
plugged my Sun into a Sun (Wangtek) tapedrive then into the Rancho 
convertor card. The Sun boots ok from the tape, but using format(8), 
the disks are not seen. If the disk tray is powered off then on, the
tape drive rewinds and clatters about (implying a SCSI reset?) but
still no sign of the disk.

	a) Is the RT-SDA convertor two way?
	   Originally it was used with a differential SCSI host
	   and single-ended tape & disk drives. I want to use it
	   with a Sun so the host is single-ended and the Emulex
	   is differential.

	b) Anyone know about the MD24/C? Is it like a MD21? Are the
	   dip switches the same? What LED's should be lit?

I need to get some disk working with my Sun, and I'd like to use the 
kit I have already, though at worst I suppose I could buy a couple of
MD21's...

If anyone out there can offer any help, suggestions or likely sources of
more information I'd be most grateful, email to addresses below preferred.

Supplemental info:

	Emulex 		MD24/C
	Assy		MU2410401 Rev C	(c)1986
	Firmware	MD2410201-02B
	ROM (?)		E80C
	SW1-1		off
	SW1-2		on
	SW1-3		on
	SW1-4		off
	SW1-5		off
	SW1-6		off
	SW1-7		on
	SW1-8		on

	Rancho		RT-SDA Rev T

-- 
Simon
------------------------------------------------------------------------
Simon Greaves                   | Janet:        censjg@uk.ac.hw.clust
Systems & Comms programmer      | Internet:     simong@festival.ed.ac.uk
Computer Centre                 | Fax:          +44 31 451 3261
Heriot-Watt University          | Voice:        +44 31 451 3265
Edinburgh EH14  4AS             |
Uk                              | "Pretty with hairy legs" --A.Belew

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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!bnr.co.uk!uknet!edcastle!hwcs!caledonias3.caledonia.hw.ac.uk!censjg
From: censjg@caledonias3.caledonia.hw.ac.uk (Simon Greaves)
Newsgroups: comp.sys.ibm.pc.rt,comp.sys.sun.hardware,comp.sys.sun.misc
Subject: Emulex MD24 info/SCSI help?
Message-ID: <1993Jan5.160527.5849@cs.hw.ac.uk>
Date: 5 Jan 93 16:05:27 GMT
Sender: news@cs.hw.ac.uk (News Administrator)
Organization: Department of Computer Science, Heriot-Watt University, Scotland
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