It's obvious that there is no longer any hope for my soul. I have joined
the TTY virtualization thread.

> Mmm, DMZ32/Able VMZ to DZ-11. No modem control (or polled, and
> half-baked at that).  *You* may not care what the controller is...

I have a problem at the other end of the technology spectrum. A number
of serial devices support synchronous communications as well as asynch.
I don't want to have to guess which tty* device supports HDLC.

Cheers,
Lloyd