It's a DE9, not a DB9 (but we know what you mean)(news.sparkfun.com)
416 points by jgrahamc | 270 comments
SparkFun blog post explaining that the common 9-pin serial connector is properly called DE9, not DB9, and the history of D-sub naming.
#rs232 on Hacker News
2 stories tagged rs232, newest first.
Things Every Hacker Once Knew (2017)(catb.org)
327 points by prakhar897 | 172 comments
Eric S. Raymond's essay on obsolete computing lore once common among hackers, covering modems, RS232, octal, terminals, ASCII, and pre-Internet networks.