DEC VT220 Technical Manual page 159

Command
Flow control
Indicator (LEOs)
Keyclick
Bell
Keyboard 10
Keyclick for CTRL key
Temporarily inhibit autorepeat
Jump to test mode
Change all autorepeat characters to down only
Enable/disable autorepeat
The jump to power-up command is FO hexadecimal.
Representation
0001
0010
0011
0100
0101
0111
1000
1001
1010
1100
The following are some of the peripheral commands.
• Flow control -- The system module can lock the keyboard
with the inhibit keyboard transmission command. When the
keyboard is unlocked, it responds with an error code if
any keystrokes were missed (refer to section 7.5.6.2).
• Indicators (LEOs) -- Figure 7-12 shows the LED parameter.
Figure 7-13 shows the LED layout on the LK201 keyboard.
• Audio -- Figure 7-14 shows the audio volume parameter.
Figure 7-12 Indicator (LED) Parameter
o
0 0 0
LED 4 LED 3 LED 2 LED 1
Figure 7-13 Indicator (LED) Layout
07 06 05 04 03 02 01 00
morn
3-B;T
VO~UME
Figure 7-14 Audio Volume Parameter
7-33