52-pin D-Sub?

Nigel Johnson nw.johnson at ieee.org
Thu Feb 27 19:26:04 CST 2020

More in the trivia department, the DA15 was used for AUI interconnection 
in the 10base-5, -2, and early -T days, as well as analog joysticks.

I'm surprised to see wikipedia saying that the high-density ones had DA 
to DE designations, I have only seen them in catalogs with full part 
numbers.  Could this be a backronym-style regression?



On 27/02/2020 19:51, Fred Cisin via cctalk wrote:
> On Thu, 27 Feb 2020, Paul Koning via cctalk wrote:
>> 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.
> A trivial data point:
> DC-37 was used by PC (5150), XT (5160) for external floppy drive,
> Used a lot of those, especially for tape drives and infrequently used 
> drives, such as 3.25" and 3", 720K 5.25", 100tpi 5.25", 67.5 tpi 3.5", 
> etc.
> also used even by IBM on some add-on external floppies for some PS/2s.
> DC-37 was also on the externally-controlled Canon CX printer engines, 
> so I had some cables and even switchboxes for those. 
> (Cordata/CoronaDataSystems, Eiconscript (both HP and Postscript 
> emulation!), JLaser, etc.)
> Anybody have any interest in those?
> The Amiga used a couple of D23 connectors.  I cut up some DB25s when I 
> needed them.
>>  -- as many people here know, the common 9-pin serial connector is 
>> not actually a "DB-9" connector but rather a DE-9.
> When I had a lot of DB25 cables on hand, I had a few that only had 
> pins in place in positions 1-8 and 20.  Would those 9 pins make it a 
> "DB-9"?  :-)
> -- 
> Grumpy Ol' Fred             cisin at xenosoft.com


Nigel Johnson

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