IBM 3164 ASCII Manual page 64

The following example shows how to change the line speed from 9600 to
1200 bps for the main port and the stop bit from 1 to 2 bits for the auxiliary
port.
Note: Do not set the setup values as in the example give below; they are
only examples.
Step
1. Make a copy of the
Setup Sheet
in Appendix A and write down all
the changes you will be making in this example onto that sheet.
Step 2.
a. Press and hold the Ctrl key; then press the Setup key to enter setup
mode.
b. The setup menu with the default or the previously defined values will
appear on your screen.
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Operating Mode
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SETUP MENU
Main Pert
RS-232C
PRTS
Auxiliary Port
4-5