30 Mar
2001
30 Mar
'01
12:49 p.m.
Now there's a case I had never worried about. I guess it could come up, since
the signals really needed for VGA are just the six video/return signals and the
two sync's and a common for them. That's 9, and certainly would warrant a valid
connector configuration that one could call DE9, though that one already exists.
I'm glad I don't have to explain that. There is, by the way, another more
"current" name for the 3-row, 'E'-shell connector commonly seen with 15
pins in
it in VGA applications. I'm not remembering it, though.
Dick
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, March 30, 2001 11:22 AM
Subject: Re: D connector tirade (was: Re: Age-old ethernet equipment)
>
> 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
Yes, that's the explanation I heard for why the 9 pin is size E (rather
than A, with all the others moving up one letter).
number of POPULATED pin locations.
The problem with that notation is : what do you call a connector formed
by taking a VGA connector shell (for want of a better name) and puting 9
pins in it. It can't be a DE9 because that's the normal E-shell with all
positions populated.
Also, IIRC, there were DE3 and DE5 connectors used by HP for serial lines
at one point. And the pin spacing was not the same as either the normal
DE9 or high-density DE15.
No, I think the number _has_ to be the total number of contact positions
that could be used.
-tony