20 Jul
2005
20 Jul
'05
6:47 a.m.
-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Tony Duell
Sent: Tuesday, July 19, 2005 2:43 PM
To: cctalk at classiccmp.org
Subject: Re: Mystery box
Of course not. But this was a one-off box so I thought it reasonable to
conjecture based on the common uses of this connector.
The connector is a DB-37, used mostly for RS-499, but this does not
look like that kind of device. The other common use for
this connector
is in Analog/Digital control devices. I agree
with the
comment that it
looks like
I don't think you can deduce anything from the choice of
connector. I've used a DC37 (note, AFAIK the DB37 does not
exist,
http://www.pccables.com/00830.htm
http://www.mycableshop.com/3rd_Level/Switchbox-DB37.htm
although the DB44 does) conenctor for all sorts of
things, not related to RS449
http://www.mycableshop.com/sku/CAB-SS-449MT.htm
or ADCs
http://www.labmaster.com/products/mcdas/html/mcdas_index.html
. IBM used it for the
external floppy drive connector on the PC, for example.
AFter all, not all DB25s are RS232 ports :-)
However, more DB25s were RS232 ports before IBM used a DB25 for a parallel
port and before they later changed serial ports to a DB9 connector.
Moreover, the DB25 connector is technically not a part of the RS-232 spec.
It is an de facto "standard."
Gil
-tony