When using the computer, you will probably want to turn the volume right down.
If your television has a continuously variable tuning control, then you just have to adjust it until you get
this picture. Many televisions now have an individual push button for each station. Choose an unused one
(e.g. ITV2), & tune it in.
If you get stuck with the computer, remember that you can always reset the computer & get back this
picture by taking out the '9V DC IN' plug and putting it back again. This should be a last resort, because
you lose all the information in the computer.
Note: This description of the television applies to Britain, where there is a UHF system using 625 lines at
50 frames per second. This will work in some other countries (for instance most Western European
countries except France). The USA, uses VHF & 525 lines at 60 frames per second.
Now that you've set up the computer, you'll want to use it. If you already know the computer language
BASIC, then read appendix C & use the rest of the manual only to clarify the obscure points.
If you're a novice, then the main part of the manual has been written for you. Don't ignore the exercises;
many of them raise interesting points that are not dealt with in the text. Look through them, & do any that
take your fancy, or that seem to cover ground you don't understand properly.
Whatever else you do, keep using the computer. If you have a question 'What does it do if I tell it such &
such?' then the answer is easy: type it in & see. Whenever the manual tells you to type something in,
always ask yourself, 'What could I type instead?' & try out your replies. The more of your own stuff you
write, the better you will understand the ZX81. (This is called unprogrammed learning.) Regardless of what
you type in, you cannot damage the computer.
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