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OPERATING EXPENSES
SECTION 3
3.6
KEYBOARD KEYS
Figure 3-1 shows the keyboard arrangement.
3.6.1
Operating Features
Automatic Repeat.
This feature causes a character to repeat itself about
15 times per second if the key is held down for more than one-half second.
Repeti-
tion continues until the key is released.
N-Key Rollover.
This feature allows several keys to be struck at the
same time without loss of characters or commands.
Data entry, however, is in the
order of actual key switch closures.
(NOTE:
It is virtually impossible to strike
more than one key so that switch closures will be simultaneous.)
3.6.2
"Typewriter" Keys
This group of keys includes the alphabetical, numerical, punctuation,
and symbol keys plus SHIFT/LOCK, Space Bar, TAB, CR (Carriage Return), and LINE
FEED.
They are arranged as shown in Figure 3-1.
Individually they perform many
of the same functions as on a typewriter or a teletype machine.
3.6.3
Numt)ri c Pad Keys
Some terminals have a numeric pad, shown in Figure 3-1.
These keys dupli-
cate the numerical, comma, and period (decimal point) keys in the "typewriter" group-
ing.
That is, striking a key in the numeric pad has the same effect as striking the
corresponding key in the "typewriter" group.
3.6.4
Escape (ESC)
ana
Control (CTRL) Keys
The escape (ESC) and control (CTRL) keys are each used with one or more
other keys to initiate functions or characters for which special function keys are
not provided.
3.6.5
Cursor Control Keys
The five cursor control keys, labeled with heavy arrows and HOME, control
cursor movement.
The cursor moves in the direction of the arrows or to its home
position (top left corner of screen) .
•
3.6.6
Next Line
(.J)
Key
This key moves the cursor to the start of the next line, or to the start
of the first line if the cursor is in the last line when the key is depressed.
3.6.7
Function Keys and Indicators
The remaining keys are special function keys.
They initiate commonly
used operations.
Some include indicator lights to show terminal status.
These
keys are identified in Figure 3-1.
3-4
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