>is there any chance to get the serial ports on a pmax (especially on a
>5000/200) higher than 19200 - there is a line in
>src/sys/arch/pmax/dev/dc.c saying:
>
>#ifdef notyet
>        { 19200,LPR_B38400 },   /* Overloaded with 19200, per chip. */
>#endif

>what does this mean - and how far is not yet ?

On the 5000/200 *only*, there's a bit on the baseboard "system
register" that causes the dc7085 chip to output 38400 instead of 19200
for all lines set to 19200.

I've never had a reason to implement the code to check that 
no ports are at 19200 and then to set the bit; or to
do the converse (check that no ttys are at 38400, then clear
the bit).

I suppose just a per-chip global variable, and letting only the
superuser set lines to 38400 or 19200 -- which would toggle
the meaning for *all* lines -- would work.