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