20 Aug
2015
20 Aug
'15
9:23 p.m.
On 8/20/2015 10:16 PM, Eric Smith wrote:
It turns out that even though this bizarre variant of the 9406 uses
the Shugart pinout for the data connector instead of the MPI pinout,
and uses the same DC power connector as the Shugart, instead of the
header used in normal MPI 9406 drives, the DC power connector pinout
for the MPI does NOT match the Shugart DC pinout, as also used by the
various half-height drives I want to try. I'm becoming less and less
impressed with these MPI drives as I learn more about them.
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,
depending upon how jumper L is set. But the specs do talk about that,
and the specs on my Siemens FDD 100-8 match the Shugart power pinout
(the -5V regulator, though, is apparently option, and not necessarily
present on every FDD 100-8). There is passing mention of an SA 800L in
the Shugart OEM manual that apparently does not require this negative
supply.
JRJ