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SECTION 3 KEYBOARD OPERATION
3.1 GENERAL
If, like most people, your experience of keyboards has been hitherto
limited to typewriters, or is in fact non-existent, there is need for
explanation.
As can be seen from Fig. 3/1 (or the real thing), there are many
more keys on the keyboard than the average typewriter. These keys
fall into three main groups:
j)
The 'QWERTY' Cluster.
ii) The Numeric Pad.
iii) The Special Function Keys.
3.2 THE 'QWERTY' CLUSTER
This section of the keyboard is very similar to a normal typewriter
with the exception that it contains the following additional keys:
3.2.1
CONTROL:- When this key is held down during the
depression of any of the 'alpha-keys' (the 26 alphabet
keys) or the
@, [, \, ] ,
A
and _ keys, 32 separate 'control
codes' will be produced. These codes can be assigned to
functions as dictated by the resident software.
.
3.2.2
ESC (escape):- This key always generates the Control -
'[' code and can be assigned a function as required.
3.2.3
CAPS LOCK (capitals lock):- This key is an alternate
action locking key (press once and it stays down; press
again and it comes back up). When it is in the 'down'
position, the alpha-keys will only generate capital codes
(upper-case) .
3.2.4
DEL (delete):- This key is used to delete the individual
character immediately preceding the Cursor. According to
the resident software the required character will either
disappear from, or be repeated on, the Visual Display,
either way it will be considered by the system to have been
erased.
3.2.5
LINE FEED:- This key always generates the Control-J
code and can be assigned a function as required. A normal
LINE FEED function raises the contents of the Visual
Display up one line (scroll up).
3-1
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