Article View: comp.lang.misc
Article #6978Help: Reading LPT2 input
From: Travis Smith
Date: Tue, 22 Nov 1994 15:40
Date: Tue, 22 Nov 1994 15:40
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1651 bytes
Anyone/Everyone:
This may not pertain to this particular newsgroup, but any help on the
subject would be GREATLY apreciated... I have been experimenting with
interfacing the LPT2 port on my PC. I have no problem writing to the port,
(0378h) the TTL levels come out perfectly. My problem is reading from the port.
In order to drive the lines, I must connect the lines DIRECTLY to Vcc or
ground. No TTL driver is capable of this. It seems the the output buffer is
still enabled, as the last data writen out is the default input. I don't want
to override the output buffer. Question: how do I properly diable (tristate)
the output buffer in order to properly read the input?
Please respond via E-mail as I don't always get back to the groups
quick enough.
Thank you in advance!
-Travis J. Smith travis@ssd.intel.com
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f891f,9bda08f2f068881f X-Google-Attributes: gidf891f,public X-Google-Thread: 1025b4,9bda08f2f068881f X-Google-Attributes: gid1025b4,public X-Google-ArrivalTime: 1994-11-22 13:53:49 PST Newsgroups: comp.lang.misc,gnu.misc.discuss Path: arc1-ca.pugleaf.net!nntp.gmd.de!xlink.net!howland.reston.ans.net!gatech!bloom-beacon.mit.edu!news.kei.com!ssd.intel.com!travis From: travis@ssd.intel.com (Travis Smith) Subject: Help: Reading LPT2 input Message-ID: <CzoE74.Kr2@SSD.intel.com> Sender: usenet@SSD.intel.com Nntp-Posting-Host: ssdintel Organization: Supercomputer Systems Division (SSD), Intel References: <3agcr4$ce2@nntpd.lkg.dec.com> <5710.imc@uk.ac.ox.prg> <3asuk4$1vn@hibbert.meiko.com> Date: Tue, 22 Nov 1994 15:40:15 GMT Lines: 19