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From: gulukota@brahms.amd.com (Karunakar Gulukota)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Bidirectionality of the parallel port.
Message-ID: <1991Jun4.200702.7276@amd.com>
Date: 4 Jun 91 20:07:02 GMT
Sender: usenet@amd.com (NNTP Posting)
Distribution: ca
Organization: Advanced Micro Devices; Sunnyvale, CA
Lines: 13

I thought that the data lines on the printer port can be used in the
bidirectional mode. The OE of the LS374, which is driving the data lines
of the parallel port, is grounded. In series with the outputs of LS374,
there are 30 ohm resisters, which I don't think are enough to keep the
source/sink currents into LS374 with in limits when the data lines are
driver by an external source.

Can somebody shed some light on this problem.


Thanks,

Karunakar Gulukota