Epson P-80 User Manual download pdf (Page 51)

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

and n

, 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

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

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 81 82

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Epson P-80 User Manual Page 51