Epson Printer Interface Cartridge for the Apple IIc Manual de usuario descargar pdf (Pagina 46)

Now that you know the principles of Epson graphics, you’re ready

for two simple exercises, more densities, and then something more

complex as a basis for writing your own programs.

First Graphics Program

Your first graphics exercise could be a program that prints a single

column of dots, but it is difficult to see the pattern in a single column of

dots, so your first graphics program prints the same pattern 40 times.

Line 10 is the code for 40 columns of single-density graphics. As

usual, the example is in BASIC, but you can adapt it to the program-

ming language you prefer.

NEW

PRINT CHR$(A);"PR#l"

l@ PRINT CHR$(27);"K";CHR$(&);CHR$(0);

388

PRINT CHR$(4);"PR#$Y'

The second line is the data that is printed as pin patterns. Be sure

that you type in the semicolons in both lines:

2a FOR X=1 TO

40:

PRINT CHR$(74);: NEXT X

That’s it. Run the program to see the result below. Although it is not

as interesting as the examples at the beginning of this chapter, it does

allow you to see exactly how the mode works.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 115 116

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Epson Printer Interface Cartridge for the Apple IIc Manual de usuario Pagina 46