From owner-freebsd-hackers  Fri Feb 23 13:37:36 1996
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Date: Fri, 23 Feb 1996 13:37:26 -0800
From: Sean Eric Fagan <sef@kithrup.com>
Message-Id: <199602232137.NAA17425@kithrup.com>
To: hackers@freebsd.org
Subject: Re: 230.400 bps on serial port
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>Hayes ("Hayes Microcomputer Products") has something called an "ESP 
>Communications Accelerator".  This is essentially a smart serial card which
>has a much larger FIFO (1K), and has a switchable speed multiplier, so you
>can get 230,400, 460,800, or 921,600 bps without soldering.  Support for the
>card is at least partially there in -current, although someone said they
>weren't sure if the FIFO was fully enabled.

I have the Hayes; in my patches (which I ported to 1.1 from John Vinopal's
NetBSD changes, and then gave to Bruce to port to 2.x), the FIFO does seem
to be fully used.  I'm not sure how to tell, though ;).

I've thought about adding support for the higher speeds to the driver;
basicly, that would mean having the driver check the speed being requested,
and find the correct multiplier.

Sean.