I'm happy to see people using the correct shell letter for DSubs around here!   
Oldschool wisdom.
I get irritated hearing people on the vintage computing groups calling 
everything DB.
Here's a quick write up about it - there is no DB9! 🙂

https://www.rogerarrick.com/dcon/
[https://www.rogerarrick.com/dcon/dcon_1000.png]<https://www.rogerarrick.com/dcon/>
RogerArrick.com D-Subminiature Connectors 
Explained<https://www.rogerarrick.com/dcon/>
D-Subminiature Connectors. In the 1950's the D-subminiature connector was 
introduced and became popular on computers for communications. The pins are 
small and designed to carry low-voltage signals, not for power, although pins 
can carry an amp or more.
www.rogerarrick.com

________________________________
From: Dennis Boone via cctalk <cctalk@classiccmp.org>
Sent: Saturday, February 1, 2025 10:43 AM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org>
Cc: Dennis Boone <d...@msu.edu>
Subject: [cctalk] Re: RS232 then and now

> One used to (in the 1970s) be able to purchase off-the-shelf "long
 > haul" modems that converted between EIA signal levels and
 > current-loop.

Sometimes called "line drivers", because that's not confusingly
overloaded terminology or anything.  I was about to say "e.g. Gandalf
LDS family", but iirc those were actually _leased_, not purchased.

 > If the 25-way DSUB connector bothers you, have a look at RS-449,
 > which employs a 37-way (DC37) connector

Some may be amused to remember that the DB/DC/... family of connectors
were known as "D-subminiature" when introduced.

De

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