Serial Direct Cable Connection, DB9, DB25, COM Ports and Pinouts
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RS232 serial cable pinout information - Lammert Bies
DB25 Male to DB25 Female Low Profile Null Modem Adapter - Sealevel
Null modem cable, question - English Amiga Board
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Advanced Serial Debugging Guide - AmigaOS Documentation Wiki
The RS232 Standard
RS-232 Connections That Work: Connecting Devices or Converters - Advantech