Epson LX-90 User Manual - Apple IIc 8699 PIC for LX-90 - Page 46

First Graphics Program, PRINT CHR$A;PR#l, l@ PRINT CHR$27;K;CHR$&;CHR$0, 2a FOR X=1

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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 programming language you prefer. NEW 5 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. 44

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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
5
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.
44