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To: roberto@blaise.ibp.fr (Ollivier Robert)
cc: dfr@nlsys.demon.co.uk, joerg_wunsch@uriah.heep.sax.de, hackers@FreeBSD.org
Subject: Re: Speed while printing 
In-reply-to: Your message of "Sun, 02 Apr 95 18:28:23 +0200."
             <9504021628.AA25744@blaise.ibp.fr> 
Date: Sun, 02 Apr 95 11:08:10 -0700
From: Bakul Shah <bakul@netcom.com>
Sender: hackers-owner@FreeBSD.org
Precedence: bulk

> I've been using the interrupt version as lpt0 for months and I do not
> have any slowdown when using it.

Apparently it is somewhat printer dependent.  If the printer
deasserts *BUSY a few microseconds _after_ asserting *ACK,
and the interrupt handler routine is entered within this
window, it will return without doing anything.