What is differential SCSI?

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#1033

From: Simon Greaves
Date: Wed, 11 Nov 1992 10:45

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I have a disk tray (4 x hard drives connected to one SCSI controller) which has two Centronics type SCSI connectors on it labelled Host and Aux. Inside the box there are two PCB's, one an Emulex MD2410201-02B and the other a Rancho Technology RT-SDA.

The RT-SDA card has a 50 way connector at each end, one labelled differential side (connected to the Host connector on the back) and the other labelled single ended (connected to the Aux connector on the back). So this card is a converter between single ended & differential SCSI. The Differential side then goes to the Emulex controller card.

The disk tray is/was used with an IBM RT 6150 fitted with an IBM SCSI card and mounted using the varyon command.

What I want to know is:

	What is Differential SCSI & how does it differ from single ended?

	Is it possible to connect this box directly to a Sun or a Dec (I think
 	they're single ended??)

	Any information most welcome.. (email preferred)

Thanks
--
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
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From: censjg@caledonias3.caledonia.hw.ac.uk (Simon Greaves)
Newsgroups: comp.sys.ibm.pc.rt
Subject: What is differential SCSI?
Message-ID: <1992Nov11.104513.1412@cs.hw.ac.uk>
Date: 11 Nov 92 10:45:13 GMT
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Organization: Department of Computer Science, Heriot-Watt University, Scotland
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