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From: burton@parcvax.Xerox.COM (Philip M. Burton)
Newsgroups: comp.sys.ibm.pc
Subject: LPT3 support without an installed Mono Display Card - Query
Message-ID: <133@parcvax.Xerox.COM>
Date: Thu, 11-Dec-86 14:23:19 EST
Article-I.D.: parcvax.133
Posted: Thu Dec 11 14:23:19 1986
Date-Received: Sat, 13-Dec-86 21:50:43 EST
Distribution: na
Organization: Xerox PARC
Lines: 17
Keywords: LPT3, DOS patch

I would like to configure a second parallel port in my PC AT as LPT3, and use 
the LPT2 interrupt for another purpose.  DOS doesn't recognize LPT3 without a 
mono card installed.  It seems silly to get a mono display card, which I don't 
need, just to get LPT3 support from DOS.

Does anyone know of a patch to DOS, preferably 3.1, to support a normal LPT1
plus LPT3?  (Do I lose any significant functionality, driving either an Epson 
or a Diablo 630 printer?)

Alternatively, does anyone know how to hack a cheapie AT parallel/serial, or 
AT multifunction card to make the parallel port look like the one in the mono 
display card?  Please be very specific.

Thanks in advance,

Phil Burton
Xerox Corp