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Date: Thu, 06 Feb 1997 18:05:36 -0800
From: Julian Elischer <julian@whistle.com>
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To: Paul Traina <pst@jnx.com>
CC: hackers@freebsd.org, bde@freebsd.org
Subject: Re: serial ports at 230k
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Paul Traina wrote:
> 
> Does anyone have any experience with running 16550A's at 230kbps under FreeBSD?
> Yes, I know, the driver doesn't support it currently, but has anyone played?

yes 
I've played but the hard part is getting the hardware..

you need to add a second "mode" to sio.c
that allow it to use a second baud rate table
and somewhere you have to kick the io ports of the device to 
do whatever is needed to make it run in turbo mode..
this is usually machine dependent.