DEC VT220 Technical Manual page 160

The audio has the following volume levels.
000 -- highest
001
010
011
100
101
110
III -- lowest
Either keyclick or bell (or both)
keyclick or bell is disabled, it
system module requests it.
can be disabled. When the
does not sound, even if the
The following are additional peripheral commands.
• Temporary autorepeat inhibit -- stops autorepeat for this
key only. Autorepeat automatically continues when another
key is pressed.
• Disable/enable autorepeat across keyboard -- stops/starts
metronome code transmission without affecting autorepeat
timing or division settings.
Change all autorepeat to down only -- changes division
settings for all autorepeating divisions to down only.
• Request keyboard ID -- causes keyboard to send a two-byte
keyboard ID. Keyboard does not jump to powerup.
• Reinitiate keyboard causes keyboard to jump to its
powerup routine. The system module should not try to
transmit anything to the keyboard until the last byte of
the power-up sequence is received.
•
Jump to test mode
production test.
is a special test mode for
• Reinstate defaults -- sets the following functions back
to the default settings after a successful power-up
self-test.
Division mode settings
Autorepeat interval and timeout rates
Autorepeat buffer selections
Audio volume
Control key keyclick
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