Re:DB-19: Resurrecting an Obsolete Connector (2016)
by ncmncm on Thursday October 24, 2019 @03:42PM
(#21348446)
There were never DB-9 connectors; they were DE-9s.
The "DB-this" and "DB-that" naming originated by ignorant analogy with the (correctly-named) DB-25 connectors that the DE-9s were replacing. Hint: The letter after the D is the size. DBs had room for two rows of 12 and 13 pins on 1/10 inch centers, on down to DE with room for only 4 and 5 pins with that spacing. Later, the DE shell was used with closer spacing for three rows of pins, for video monitor cables.
Once enough ignorant people took to calling them DB-9 and trying to buy them by that name, the vendors started hawking them that way.
The "DB-this" and "DB-that" naming originated by ignorant analogy with the (correctly-named) DB-25 connectors that the DE-9s were replacing. Hint: The letter after the D is the size. DBs had room for two rows of 12 and 13 pins on 1/10 inch centers, on down to DE with room for only 4 and 5 pins with that spacing. Later, the DE shell was used with closer spacing for three rows of pins, for video monitor cables.
Once enough ignorant people took to calling them DB-9 and trying to buy them by that name, the vendors started hawking them that way.
https://en.wikipedia.org/wiki/D-subminiature#DE-9