Organization: Department of Computer Science, Heriot-Watt University, Scotland
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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 (an AIX command intended to mount disks in removable hard disk units, basically just a mount).
What I want to know is:
What is Differential SCSI & how does it differ from single ended?
How can I tell if it's SCSI1 or 2?
Is it (likely to be) possible to connect this box directly to a Sun or
a Dec (aren't they single ended?)?
Any information most welcome.. (email preferred)
I hope to get a Sun soon, and would like to use this (~1Gb) disk with it. I suppose I can get a different controller if this one can't be persuaded to work, but it would be nice to be able to just plug it in...