AT&T Scsi Drive Specs

From: Eric Smith <>
Date: Sat Jan 20 19:09:26 2001

> does this mean that
> differential SCSI doesn't have any ground pins, instead using these for
> the complement?

There are some ground lines, but not nearly as many as in single-ended
SCSI. "Narrow" SCSI has 9 data lines (8+parity) and 9 control lines, so
there are 18 differential pairs.

Another interesting feature of HVD (high voltage differential) SCSI is
that there are no "active terminators". The terminations are just single
resistors (110 ohm? I forget.) between the signals of a pair. No
termination voltage source needed.
Received on Sat Jan 20 2001 - 19:09:26 GMT

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