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DIDS-402-2AM13
4-15.1 Keyboard-Monoscope Circuits
The circuits responsible for developing visual characters for display on
the CRT screen are shown in figures 4-13 and 4-14.
The development of visual
characters begins at the keyboard when the display terminal operator depre sse s
a character key, and terminates at the CRT when a corresponding visual charac-
ter is produced on the CRT screen.
4-15.1.1 Keyboard Assembly All
The keyboard functions as a display terminal input by permitting operators
to compose, format, and edit data messages for later transmission to the CPU.
The keyboard consists of 71 separate keys which are generally divided into two
classes: character and function.
The term character keys refers to a specific
group of keys which are capable of producing visual characters on the CRT
screen.
The term function keys generally refers to those keys which do not pro-
duce visual characters on the CRT screen.
Example s of function keys are those
used for editing, cursor control, and transmitting data.
The function keys are
listed and categorized as follows:
Edit Keys
ERASE MSG
ERASE LINE
INSRT
DEL
Cursor Control Keys
-
-
~
t
CURSR RESET
ADV LINE
CYCLE
NEW LINE
Transmit Keys
END
XMIT
Entry Control Keys
SHIFT
SHIFT LOCK
CONTROL
Logic Control Key
BREAK
4-20
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