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6
7
The same key pressed while the
key is pressed c l e ars the
screen. Hold down
If there were any characters on the screen, then they were all erased ...
or "cleared."
The best exercise to learn the individual cursor movement keys is to
move the cursor right, down, left, and up in a sort of circle path to
return to the original starting position. You will move the cursor on
the screen in a path like this:
(If you press the last key too many times and wind up in position you
have discovered another feature called "wrap-around" which has
moved the cursor to the end of the previous line. Type
without the shift key held down to move the cursor
ways. Try moving the cursor around the screen between two arbitrary
points. Practice until you are confident you can put the cursor where
you want it on the screen.
Exercise 3 - Using graphics
If you have accomplished moving the cursor, then you can use your PET
like an electronic sketch pad. The characters on the upper half
of each keytop are called graphics. When you hold down the
key as you type, the graphics are printed instead of letters or
numbers.
Now let's draw a figure that should look very much like this by the time
we get through.
Figure 4. Rocket drawing using the graphics keys
Follow the instructions exactly as shown in the diagram that follows:
to clear the screen.
Move the cursor to the right 6 spaces: as shown in the diagram.
Press
I
SHIFT
I
and type the graphics. Now you use the cursor keys
to get the cursor in position to type the next line.
NOTE: Shaded keys are keys that must be accompanied by
pressing the
I
SHIFT
I
key.
this time and then press
Both functions of
this key affect the
screen.
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