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
