Power supply connector pin crimping, and 8-inch FDD power connectors (another chapter in the Quay 900 saga)

[Eric Smith]

On Thu, Aug 20, 2015 at 10:23 PM, Jay Jaeger <cube1 at charter.net> wrote:
> One of the things I learned in working with the SA-800 series is that
> they can accept either unregulated -12V or regulated -5V on pin 4,

I've dealt with that issue on full height drives.

The half-height drives, and some newer-model full-height, don't need a
negative voltage, and leave that pin of the connector as a no-connect.
I've verifed that pin 4 is specified as a no-connect in the
documentation for the Mitsubishi M2896-63 that I attempted to use in
place of the MPI drive, and also the Tandon TM848 series and the Qume
242.

Apparently the MPI 9406 -22 variant has some other incompatibility
with the standard Seagate DC power connector configuration, but I
haven't taken the time to trace out the power wiring in the Quay 900
any more than was necessary.