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
