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This article is from the alt.comp.hardware.homebuilt Frequently Asked Questions. It is maintained by Mark Sokos (msokos1@gl.umbc.edu) with many contributions from others.

2.26 How do I make a null modem/laplink cable?

Pinouts for most IBM cables (laplink serial/parallel, etc) can be found in the comp.sys.ibm.hardware.* FAQ, which may be obtained via ftp from: ftp://rtfm.mit.edu/pub/usenet/comp.sys.ibm.hardware.misc

http://www.airborn.com.au/rs232.html --Schematic diagrams showing how to wire up RS232 connectors with handshaking and without, loopback plugs and null modem

 

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