The state of the caps lock and shift lock indicators is controlled by the

and keys -- each depression switches the corresponding indicator ON or

OFF, depending on its current state. Note that it is impossible to illuminate

both caps lock and shift lock from the keyboard -- the computer uses this

simultaneous indication to denote a particular circumstance, as described

below.

The two keys have no effect while shift lock is ON. If shift lock is OFF,

(regardless of the setting of caps lock) the keys cause upper-case letters

and symbols to be produced if either is held down while another key is

depressed. The keys do not affect the shift lock indicator.

A further option is provided by pressing +. In this case, caps lock is

switched ON as usual but in the input of subsequent characters lower-case

letters of the alphabet may be obtained by holding down a key.

Whether caps lock or shift lock (or neither) is ON for a particular session at the

computer is a matter of personal preference although the choice will also

depend upon the type of input, for example:

-- Conventional text, such as an item of correspondence input to the VIEW

word-processor, consists mainly of lower-case characters interspersed with a

few capital letters;

-- A BASIC program consists of a mixture of special upper-case words (called

keywords) interspersed with other, often lower-case words (called variable

names).

(which is an abbreviation for control) has no effect on its own but it may

be used in conjunction with other keys on the keyboard to invoke a number of

special effects. For example, + G causes the computer to emit a short

bleep; + L clears the display screen. Other examples are given in the

remainder of this guide and a summary of the various effects is given in

Appendix 7.

is provided to allow the range of characters generated by the keyboard to be

extended, for foreign language use in particular. When pressed simultaneously

with the and keys the next character to be typed on the keyboard

will be reinterpreted as a special symbol by the computer. You should not

concern yourself too much with this feature for the moment.

normally acts like a space-bar depression although it has a special

significance when using the VIEW word processing software, as described later

in this guide.

is used to indicate that a particular line of input is complete -- prior to

the depression of , may be used to erase the most recent

character(s) you have typed.

A 6