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From: jgt2 AT Lehigh DOT EDU (JESSE THILO)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: LOOP BACK PLUG
Date: 26 Jul 1995 09:26:49 -0400
Lines: 25
References: <3v44ni$rju AT vivaldi DOT telepac DOT pt>
Nntp-Posting-Host: ns4-1.cc.lehigh.edu
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

Paulo Jorge Prates Lopes (paulojpl AT telepac DOT pt) wrote:
: I have been trying to make a LOOP BACK PLUG for both Serie and Paralell 
: ports but without any luck so far, so would someone please tell me the 
: pinout.

Short the following pairs (or triples) of pins:

9-pin serial:
1-4-9
2-3
6-7-8

25-pin serial:
2-3
4-5-6
8-20-22

Parallel:
5-15
6-13
7-12
8-10
9-11
-- 
Jesse Thilo <jgt2 AT Lehigh DOT EDU>  Voice: 610/758-1840  Fax: 610/974-2872