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To: Bruce Evans <bde@zeta.org.au>
cc: hackers@freebsd.org, bde@freebsd.org
Subject: Re: serial ports at 230k 
In-reply-to: Your message of "Fri, 07 Feb 1997 07:03:27 +1100."
             <199702062003.HAA01985@godzilla.zeta.org.au> 
Date: Thu, 06 Feb 1997 12:52:13 -0800
From: Paul Traina <pst@jnx.com>
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Good guess, but I'm actually trying out a 3COM ISDN TA that runs at 230k.

  From: Bruce Evans <bde@zeta.org.au>
  Subject: Re: serial ports at 230k
  >Does anyone have any experience with running 16550A's at 230kbps under FreeB
>>SD?
  >Yes, I know, the driver doesn't support it currently, but has anyone played?
  
  Not me.  I checked the PC16550D specs recently.  The maximum speed is
  1.5Mbps like I remembered.
  
  If you only care about remote gdb throughput to an sio port on a
  FreeBSD host, note that the protocol is non-streaming so it is limited
  to 1 packet per clock tick (30Kbps effective throughput at best) by the
  host's pseudo-DMA timeout routine.
  
  Bruce