11 Apr
2001
11 Apr
'01
7:53 p.m.
Anything's possible for the military establishment, but I'd not bet on it being
right more than 1 ppm. This connector family is not old enough, methinks, to be
in any military standards. After all, they still love those nearly $1k/each in
100k quanatity 38999-series connectors and they still require that the wire be
#16 and soldered. A reference in a military document doesn't make it right.
You need a Centronics document.
Dick
----- Original Message -----
From: "Russ Blakeman" <rhblake(a)bigfoot.com>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, April 11, 2001 4:17 PM
Subject: RE: 50 pin SCSI to 50 pin centronics
I'll have to dig but it was always referenced as a
CENTRONICS-36 or
CENTRONICS-50 in our MIL-STD books and HP manuals when I was a
missile/eleectronics tech in the AF, until 95 when I retired. I keep contact
with a former coworker in OK that works for a contractor for the ACM/ALCM
project office and he has tons of references in his office and might be able
to locate it and fax or attach a copy to me.
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of Tony Duell
Sent: Wednesday, April 11, 2001 4:07 PM
To: classiccmp(a)classiccmp.org
Subject: Re: 50 pin SCSI to 50 pin centronics
The 50 pin with the hooks on the side is actually referred to as a
Centronics 50 pin, or SCSI-I (external SCSI as well on older
machines before
SCSI-2 came along)
Do you have a reference for that (note : after the long discussion we had
a couple of weeks back on the D-connector names, I am not going to take
'Well %company call them that in the catalogues' as a reference)?
Most companies in the way back used either what
was cheap or
had specials
made up just to keep you coming to them for
cables,
connectors, etc. Why
does Apple had a different AUI port than anyone
else? Why are
there 9 pin
and 25 pin RS-232's.....Why is Apple's on
an 8pin mini-din?
We went through this a few weeks back, didn't we? As I understand it :
The Apple AUI port is different partly because it uses a 5V supply rather
than the 12V one on a standard AUI port. So I guess it makes sense to
have a different connector. We can argue for months whether Apple should
have stuck to the standards, though.
IIRC, the RS232 standard specifies a 25 pin connector. So strictly there
are no 9 pin RS232 ports. If you mean why do PC/AT machines have a DE9P
for the serial port, it was because (a) 9 pins is enough for the active
signals on said port and (b) you can fit a DE and a DB on a single PC
bracket, so you could have a combined parallel/serial adapter card. Which
IBM introduced with the PC/AT IIRC.
And Apple used the 8 pin mini-DIN on the Mac+ and later because there
wasn't room for the DE9 connector used on the earler Macs. Hardware
hackers have been complaining ever since -- those mini-DINs are about the
worst connectors in the world to wire!
-tony