RTS/CTS flow control

[Vernon Schryver]

Microport says that the asy driver in V/386 does not support RTS/CTS
flow control.  Experiments with a break-out box support that statement.
How do you use a Trailblazer or other high speed async device without
'hardware' flow control?  Obviously, XON/XOFF is not so hot when you
have binary data, so I didn't bother to see if that works.

Experiments with a break-out box suggest that when more than one process
opens /dev/tty00, the <<first>> close(2) drops DTR & RTS.  Did I get it
wrong?  Isn't this a bug?

Microport says that DOS programs under Merge which want to use the COM
ports run just fine with 'a=com1'.  I've found that input locks up under
load, and that output either garbles or drops characters.  What am I
doing wrong?

Vernon Schryver
vjs at sgi.com