The UART used in most IBM PC compatibles (16550) and the associated circuitry
only allow speeds up to 115,200 BPS.  You will have a very difficult time going
any higher.  Even if you had a serial port capable of going higher, you would
have to use special drivers for it, as windows assumes a 16550 or compatible,
and doesn't have the ability to set higher speeds.

Of course, you COULD use a PIC with a UART and the parallel port...

-Adam

Soren Knudsen wrote:
>
> I cant get the proggie to open my serial port at 128000/256000 baud. perhaps
> its because its not standard? can anyone rewrite it to meet the standard
> speeds as i think it could be quite usefull to me?
>
> Soren Knudsen