DEC VT220 Technical Manual page 150

While metronome codes are
key, a nonautorepeating
transmitted. The keyboard
the next metronome code,
code. The keycode to be
transmitted.
being generated for an autorepeating
keycode or special code may be
transmits this special code instead of
and then returns to the autorepeated
autorepeated is always the last byte
Example 2
The a key is held down. This produces the following transmission.
a metronome metronome
Now the SHIFT key is pressed. This produces the following
transmission.
a metronome metronome shift a metronome
Now the SHIFT key is released. This produces the following
transmission.
a metronome metronome shift a metronome ALL UPS a
metronome. • •
• If an autorepeating key is not to autorepeat (CTRL C for
example), the system module must issue a temporary
inhibit autorepeat command. This halts the transmission
of any metronome codes or keyclicks for that key only.
Metronome codes continue when another key is pressed. The
command must be issued after the keycode for the
autorepeating key is received.
Autorepeat can be enabled and disabled independently of
the division settings by using the enable/disable
autorepeat commands. These commands apply to all keys on
the keyboard. When autorepeat is disabled, internally the
keyboard continues to autorepeat characters. However, it
does not transmit metronome codes or keyclicks. When
autorepeat is enabled, the keyboard transmits the
metronome codes from the point they were before
autorepeat was disabled. This may be within either the
timeout or interval period, depending upon the time
elapsed since the key was pressed.
• If the keyboard receives a request to change a division
mode to autorepeat while a key is pressed, the keyboard
makes the change immediately. After the specified timeout
period, the keyboard transmits metronome codes for the
pressed key. In place of the first metronome code, the
keyboard transmits the keycode of the autorepeating key.
All autorepeating division modes can be changed to only down with
one command. This and other 4utorepeat commands are grouped with
the peripheral commands (refer to section 6.5.5.3).
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