Re: SCSI cable and strategy shopping

[Wire Moore <wirem@teleport.com>]

on 2/21/2000 20:36, Steve Jacobson at stevelists@jjworld.com wrote:

> 
> The rule for scsi is that you can mix SCSI-1, SCSI-2, and SCSI-3, but when
> you do, the bus speed defaults to the slowest device.  That is, if you
> intermix SCSI-1 and SCSI-2 devices on the same bus, the SCSI-2 speed is lost
> and the bus will only go up to 10 MB/s.
> 

The comments above are incorrect on a couple of points:
1) SCSI-1, 2 and 3 can share a bus, and the transactions will be completed
at the maximum rates assuming the initiator and the target both can sustain
this rate. Ultra2 (LVD) will run in ultra mode if legacy devices are
attached.
2) SCSI-1 is 5Mb/s, not 10.

WRT to the scanner, it's certainly a SCSI-2 device, with 10MB/s transfers.
It probably has either a SCSI-3 connector (HD50 which it two rows of fine
pitch pins with a clip socket) or DB25, which is the older SCSI-2 connector
with a larger pins and screws. On the DB25, data grounds are coalesced onto
a single pin so that all the lines fit.

Wire

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