Serial Direct Cable Connection, DB9, DB25, COM Ports and Pinouts
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25 Pin Serial Port Male / Female Adapter DB25 RS232
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RS232 serial cable pinout information - Lammert Bies
How Serial Ports Work | HowStuffWorks
Serial port - Wikipedia
RS232 connector pin assignment
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Serial Direct Cable Connection, DB9, DB25, COM Ports and Pinouts
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Does the 25-pin IBM PS/1 serial port connector contain two serial ports? - Retrocomputing Stack Exchange
The Serial Port
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RS232 Pinouts and connections. RS232 Pinout data lines explained in detail.
