wilbo666 / RS232
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Null modem - Wikipedia
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File:Null modem sync.svg - Wikimedia Commons
File:Null modem cable 1.jpg - Wikimedia Commons
File:Nullmodem.png - Wikipedia
Null modem - Wikiwand
Null modem - Wikipedia
What is the schematic of an RS232 Null-Modem? - Ferguson Wiki
File:D25 Null Modem Wiring.png - Wikimedia Commons
