barrett@jhunix.HCF.JHU.EDU (Dan Barrett) (03/27/91)
If you have any printers hooked up via LAT, then there is something
you should know. According to Ultrix Software Support, you should NEVER
associate your very first LAT tty with a printer: it causes unpredictable
glitches.
This is undocumented.
You can find your "first" LAT tty by doing to /dev and typing:
$ file tty* |grep 39
tty02: character special (39/0) LAT #0 terminal #0
tty03: character special (39/1) LAT #0 terminal #1
tty04: character special (39/2) LAT #0 terminal #2
tty05: character special (39/3) LAT #0 terminal #3
tty06: character special (39/4) LAT #0 terminal #4
...
In the above example, tty02 is the first LAT tty (LAT #0, terminal #0).
So, you should never dedicate /dev/tty02 for a LAT printer -- always
for a normal terminal.
Put a note in /etc/ttys next to this tty entry, saying that
it should always be used for a terminal and never a printer.
I don't know anything more about the reason. In fact, when I
asked the Software Support engineer, he said they had discovered this
glitch "by experience".
Dan
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