23 May
1998
23 May
'98
12:31 a.m.
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