If you type:

M0DE128

the screen will clear and a smaller prompt will appear in the top left-hand

corner.

You have now selected mode 128 which provides:

-- 32 lines of text, each 80 characters in length;

-- the full ASCII character set (see below);

-- high-resolution, 2 colour graphics.

Now type:

PRINT"White on black''

COLOURØ:C0LOUR129: PRINT"Black on white"

MOVE 6ØØ,5ØØ:PLOT149,75Ø,5ØØ

MOVE 6ØØ,5ØØ: PL0T157 , 7ØØ,5ØØ

You may like to try repeating the same sequence of examples in each of modes

129, 130, 132 and 133 -- the remaining modes which offer a graphics facility.

Notice the effect that each change of mode has on the size and shape of each

character you type, the colours produced and the 'crispness' of the circle.

Modes 131 and 134 offer a text-only display consisting of 25 lines of 80 and 40

columns respectively.

The Welcome software contains a demonstration of the capabilities of the

various screen modes and Appendix 1, on page Appl.l, gives a full specification

of the characteristics of each mode.

A note on character sets

Computers use simple codes to represent characters which are stored in

memory or displayed on the screen and your computer offers two

internationally accepted coding conventions, namely Teletext and ASCII.

(ASCII is an abbreviation for American Standard Code for Information

Interchange.) The Teletext set is available only in modes 7 and 135 and the

ASCII set is available in all others-

It is the ASCII character set which is etched into the keytops on the computer's

keyboard and in any mode other than 7 or 135 a representation of the

corresponding character will be displayed on the screen. The Teletext character

set is identical for all the letters of the alphabet, the digits 0 -- 9 and all except

eight of the special symbols:

ASCII symbol: [ \ ] ^ { | }

Teletext symbol:

A 10