IBM 3164 ASCII Manual page 24

Main port
Auxiliary port
Video cable connector
Audible-alarm volume control knob
Video cable connector
This female port is used for connecting a communication cable coming from
the host system or a protocol converter, or a modem cable coming from a
modem. It uses an RS-232C or an RS-422A communication interface.
This female port is used for communicating with an auxiliary input/output
device such as another display station, terminal, or a printer. It uses an
RS-232C communication interface.
This connector is used for plugging-in the video cable.
Audible-alarm volume control knob
This knob is used to adjust the volume of the audible alarm, which sounds
under program control to alert you to certain preset conditions. You can
adjust the volume of the alarm by turning the knob:
• Clockwise to increase the volume
• Counterclockwise to decrease the volume.
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