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From: gerry@gallahad.Central.Sun.COM (/usr/local/name)
Newsgroups: comp.unix.wizards
Subject: RE: Synchronous device driver for SunOS
Message-ID: <6683@eastapps.East.Sun.COM>
Date: 11 Jun 91 17:56:16 GMT
Sender: news@East.Sun.COM
Lines: 22

Hi Gary,

 I hope this is what you need,        

This was written by a hardware engineer after my request
about a similer problem..

-------------
Refer to any of the Hardware Configuration Guides
 under the section heading "Serial Port Configuration and Speed".

 "The serial ports are programmed I/O devices (rather than DMA devices)
 and have only a three-character hardware buffer each although they
 support both high-speed output (up to 19.2 kbaud) and input (up to
 9.6 kbaud)."

 This statement holds true for Sun-2, Sun-3, and Sun-4 and goes back
 as far as the Aug 1984 Config Guide and as current as the Nov 1989
 Config Guide.

-----------
Gerry