From owner-freebsd-hackers  Fri Feb 23 11:39:42 1996
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Date: Fri, 23 Feb 1996 14:41:28 -0500
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To: hackers@freebsd.org
From: dennis@etinc.com (dennis)
Subject: Re: 230.400 bps on serial port
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>> Hello Hackers,
>> 
>> I need a reliable data transfer rate of 230.400 bps on the serial port for
>> PPP. Can that be done ? getty only has a setting for 115.200 bps. I have a
>> Gigabyte 586 ATEP mainboard with FIFOs. Can I use them for 230.400 bps, and
>> how ? Or should I buy a special serial card for that ?
>> 
>> Thanks,
>
>A standard 16550 in normal PC configuration has a maximum port speed of
>115,200bps.  It can't go at any faster usable speed because you're already
>at the smallest usable divisor.
>
>If you have a real 16550 (i.e. NatSemi, etc), and it's on a card, you can
>"overclock" it by a factor of 2 or 4 to give 230,400 or 460,800 bits per
>second.  This essentially is a crystal replacement with a soldering iron.
>Not hard but not for beginners.  FreeBSD still thinks that the port is
>115,200, you have just changed the underlying hardware to rev up the..


Don't forget to crank up those RS-232 drivers too!


db