D subminiture connectors Re: Anyone recognize this PCB?

Until relatively recently I was one of them. :-( DA is the 15-pin size, the one used by AUI Ethernet back in the heyday of 10base5. DB is the 25-pin size, the one that's standard for serial ports (de-jure standard, not the 9-pin de-facto standard). Also used for peecee parallel ports and older Macintosh SCSI, and doubtless a bunch of other things too. DC is a size I almost never see, and I don't remember the exact pin count. 37? 39? Something like that. DD is a much larger size, supporting 50 pins. Some of the older Sun equipment uses this for SCSI, which is the only use I know it from. DE is the small size, used with 9 pins for the serial connectors I mentioned above and with 15 pins for peecee video ("VGA"). I don't know why the order makes so much sense for DA through DD and then goes wonky for DE. I conjecture that when it was originally planned, nobody expected it to be used for anything that small, so the DE was tacked on as an afterthought. (I suppose they could have used D@, but that would make sense only to geeks who know their ASCII. :) I also don't know whether there are any other sizes with names. Other sizes, though rare, do exist; for example, NeXT used a D-shell connector of an odd size, with something like 19 pins, to drive their greyscale video displays. /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B