Re: Quantum Hard Drive jumpers - what are they?

[shack@pro-ict.cts.com (Randy Shackelford)]

<KCR103@psuvm.psu.edu> writes:

>I was curious what all the jumper pins on the underside of a Quantum Pro
>40 Meg hard drive were.  They are in two groups of three:
>SS EP WS     and     A2 A1 A0
>
>It seems that the A2, A1, and A0 select the SCSI ID since they were connected
>to the push button.  Do the other buttons have something to do with the
>capacity of the drive?

Yep A0-A2 select the SCSI ID. They work like three binary digits - e.g. if
all pins are open the ID is 0 and if all are jumpered the ID is 7 and
different combinations make up the numbers in between.

WS is wait-spin, determining whether the drive spins up immediately after
powerup. EP concerns parity. Drat I forget what SS is. Quantum says that they
ship their drives already correctly configured for the vast majority of
applications so I wouldn't fiddle with them.

Higher capacity drives have a neat jumper for termination instead of those
troublesome resistor packs too and maybe even more than that.
--
Randy Shackelford                              "That's right, keep dancing
shack@pro-ict.cts.com                           on the minefield"
                                                                 -Al Bundy