> The driver in question _is_ functional, at least at some basic level.

Yes, to some level.

> I use it on the Alpha all the time.  I'm writing this mail from a
> 386/20 with a 16550, dialed in at 38.4, and i see overflows
> infrequently (i.e. on average, one silo overflow once every 15 or 20
> minutes).

Well, I couldn't use it at 115200 bps for PPP.  I guess it works better
with non-continuous data flow (and in Tx direction where there are no
overflows at all).

  -jm