Prices to pay for old computers...

From: Bill/Carolyn Pechter <pechter_at_shell.monmouth.com>
Date: Sat May 23 07:31:33 1998

>
> Sam Ismail wrote:
> >
> > On Sat, 23 May 1998, Charles A Davis wrote:
> >
> > > RS-232, was a well accepted 'Standard'. Any time that you saw a piece of
> > > equipment with a DB-25 connector on it, it was almost certainly a RS-232
> > > connection. Then along comes 'Big Brother' (IBM) wanting to save a few
> > > pennies on 'printer connectors' (The Amphenol must have been _way_ more
> > > expensieve. But all the printer manufacturers still seem to be able to
> > > be able to afford it.)
> > >
> > > DB-25's that might be either a serial port, or maybe a parallel port, or
> > > maybe something else.
> >
> > It's simple:
> >
> > DB-25 male: serial port
> >
> > DB-25 female: parallel port

I seem to rember that the port gender changed at RS232C time and before
RS232C the earlier RS232's used male or femail depending on the vendor.
I also seem to remember that Mail vs Female depended on DTE or DCE designations.
The gender may have been optional.

This caused Perkin-Elmer (Concurrent) terminals to have a different gender
then DEC due to being PRE-RS232C.


Bill
Received on Sat May 23 1998 - 07:31:33 BST