30 Mar
2001
30 Mar
'01
1:24 a.m.
The origitnal concept underlying this designiation scheme was based on the
notion that you had the 'D' for the shape, the <A..D> for the shell sizes
that
were in use at the time, 'E' and beyond coming later. and a number for the
number of POPULATED pin locations.
This notion didn't catch on, however, and I think few of us will remember
references to DB3 or the like, DB3 being the 'B' shell with pins 2, 3, and 7
populated, though that was a common configuration. I remember looking for such
references and really can't say I ever ran in to any. I do remember the
description in a parts catalog, however, though I don't remember whether it was
CANNON or APHENOL, or what.
If people would use this method, it would be quite clear, however.
Dick
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Thursday, March 29, 2001 12:57 PM
Subject: Re: D connector tirade (was: Re: Age-old ethernet equipment)
I'm going to pop in and point out a pet peeve of mine. The letter
It's a pet peeve of mine too (especially when somebody claims that
there's no such thing as a DE9, and that the connector on their mouse is
a DB9).
What is
the purpose of the DB-9 connector?
My old SynOptics 2813 hubs have a DA9 as well,
and it's some odd following the D in a D-sub connector is the shell
size.
The standard options I'm aware of are:
DE-9, DA-15, DB-25, DC-37, DD-50, DE-15, DA-26, DB-44, DC-62, DE-78,
You must mean DD78 (I don't even want to think about cramming 78 pins
into a size E shell :-))
and the occasional 2DE-19 and 2DB-52. Those 19
pin "D style" connectors
that Apple, Atari & NeXT were so fond of don't really count because
they were really just an attempt to force people to buy branded
products.
I've seen the Apple disk drive connector refered to as a DF19. And a DG23
for the Amiga video connector. I don't think those names are in any way
official, but they do make some sort of sense
It's quite possible that someone made a DB-9 or a DA-9. If they did,
A friend of mine suggested that a DB9 should be the name for a DB25
connector with only pins 1-8 and 20 fitted :-). This was a common
connector on RS232 cables at one time (particularly ones made with
crimp-on pins).
No, I don't much care for that idea, but again, it has a certain logic to it.
-tony