Date: Sun, 02 Apr 95 11:08:10 -0700 From: Bakul Shah <bakul@netcom.com> 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 Message-ID: <199504021808.LAA26153@netcom7.netcom.com> In-Reply-To: Your message of "Sun, 02 Apr 95 18:28:23 %2B0200." <9504021628.AA25744@blaise.ibp.fr>
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> 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.
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