Using terminals at 19.2 kbaud on 4.2

[Doug Gwyn]

Your DEC Field Service "engineers", like so many these days, are plain
incompetent.  The DZ11 can run at 19.2KB as one of its standard speeds.
Most UNIX DZ11 drivers implement this as the "EXTA" DH11 equivalent.
I once used 19.2KB on a PDP-11/34 and saw no noticeable speed improvement
since the kernel could not keep up with the device capacity at that
speed.  (The DZ11 interrupts on every character in or out.  That is why
the KMC11B controller is so important if you have DZ11s.)