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_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Thursday, March 29, 2001 12:57 PM
Subject: Re: D connector tirade (was: Re: Age-old ethernet equipment)
> >
> > >> What is the purpose of the DB-9 connector?
> > > My old SynOptics 2813 hubs have a DA9 as well, and it's some odd
> >
> > 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).
>
> > 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
>
>
Received on Fri Mar 30 2001 - 09:24:03 BST