Null Modem cable wiring - THUNDERDOME – the ATARI site
Serial (RS232) port connectors. Pinout and signals for the serial port connector
Serial/AT Modem Adapter, DB9 Male to DB25 Female
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Serial Cable - 6FT DB9 Female to DB25 Female Null Modem | ShowMeCables.com
DB9 Female (RS-422) to DB25 Male (RS-530) Cable, 10 Inch Length - Sealevel
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The RS232 Standard
RS232 connector pin assignment
RS232 serial cable pinout information - Lammert Bies
CC2047-06 - 6ft DB9 Female to DB25 Male Null Modem Cable