Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site watcgl.UUCP
Path: utzoo!watmath!watcgl!dmmartindale
From: dmmartindale@watcgl.UUCP (Dave Martindale)
Newsgroups: net.unix-wizards
Subject: Re: 4.1bsd vs. Versatec V80
Message-ID: <891@watcgl.UUCP>
Date: Thu, 29-Sep-83 10:53:30 EDT
Article-I.D.: watcgl.891
Posted: Thu Sep 29 10:53:30 1983
Date-Received: Fri, 30-Sep-83 01:31:02 EDT
References: <2763@umcp-cs.UUCP>
Organization: U of Waterloo, Ontario
Lines: 6

The 4.1BSD driver for the Versatec DOES do DMA.  It allocates the UBA in
the strategy routine and releases it there, rather than using the more
complex ubago/ubadone interface of the disk and tape drivers, but it
is definitely not character-by-character.  Now, has anyone looked into
why it transfers data so slowly?  It was something over 30 microseconds
per transfer last time I checked.