paulkoning at comcast.net
Thu Feb 27 18:27:53 CST 2020
> On Feb 27, 2020, at 6:37 PM, Adam Thornton via cctalk <cctalk at classiccmp.org> wrote:
> I work at an astronomy facility. I get to do some fun dumpster diving.
> I recently have pulled out of the trash a plugboard with a male and a
> female D-Sub 52 connector. 3 rows of pins, 17-18-17. I took the
> connectors off the board: there's nothing back there, so this thing only
> ever existed so you could plug the random cable you found into it and its
> friends to see what the cable fit.
> I can't find much evidence that a 52-pin D-Sub ever existed.
> Is this just Yet Another Physics Experiment thing where, hey, if your
> instrument already costs three million dollars, what's a couple of grand
> for machining custom connectors? Or was it once a thing?
No idea. I just got a new L-Com catalog, which has a large section of "D-Sub" connectors and cables. It lists the following sizes:
2-row: 9, 15, 25, 37, 50 pin
3-row: 15, 26, 44, 62, 78 pin
So 52 pins is halfway between two standard sizes. For some definition of "standard", of course. 2-row 9, 15, and 25 pin are common, 37 is for RS-422 if I remember right but I haven't seen it in ages. The only familiar "high density" (3-row) connector is the 15 pin one for VGA.
Those connectors correspond to the standard D-sub shells DE, DA, DB, DC, and DD in that order -- as many people here know, the common 9-pin serial connector is not actually a "DB-9" connector but rather a DE-9.
Is the connector a DC shell with pin spacing increased from the standard 62 pin pitch? Or is it a DC-62 with some positions left unused? A picture would be interesting.
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