Excerpts from netbsd: 24-Apr-98 Internal modem, again Paul
Goyette@whooppee.co (9749*)

> # stty -f /dev/tty01 -e
> speed 0 baud; 0 rows; 0 columns;
> [...]
> com1 at isapnp0 port 0x2f8/8 irq 3: ns16550a, working fifo

>From looking at the code:
Perhaps something like
"sc->sc_frequency = COM_FREQ;"
(or whatever the frequency is with that card)
is missing in com_isapnp.c:com_isapnp_attach()?
(Compare with com_isa.c!)
This would explain that the speed calculations fail.

best regards
Matthias