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The width of one space invader in this program is 12-dot positions
(plus one blank space). This means
data to describe a single invader. We will use a series of 20 invaders for
this program. This gives you a total of 260
data.
To find n
and n
1
a remainder of 4. Enter 4 as the value for n,, and
Enter these values with a comma between them.
The program then asks you how many data per space invader.
Enter
and press
13
The program now asks the order of the data for a single invader.
The data numbers are shown at the bottom of Figure 6-3. Enter them
one at a time, pressing
gram prompts you by showing DATA? each time. Once you enter the
last data number, the program prints out.
46
, divide 260 by 256 and you get a quotient of
2
RETURN.
RETURN
Figure 6-3. Data for space invader
13-dot positions are enough
that
x 20) dot positions for
(13
1
after each data number. The pro-
with
1
as the value for n
.
2
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