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Here is the BASIC program that prints the design shown in Figures
6-3 and
6-4.
Notice that the data numbers in lines
80-140
are the same
numbers that you see in Figure
6-4.
Also note that the WIDTH state-
ment in line
10
is for IBM PC BASIC; the format may be different for
your system.
10 WIDTH "LPT1:",255
20 LPRINT CHR$(27)"*"CHR$(39)CHR$(42)CHR$(0);
30
FOR X=1 TO
126
40
READ N
50
LPRINT CHR$(N);
60
NEXT X
70 LPRINT
80 DATA
0,0,63,0,0,127,0,0,255,0,3,255,0,15,255,0,31,255
90
DATA
0,127,255,0,255,255,1,255,255,3,255,7,255,
255,15,255,255
100 DATA
31,255,254,31,255,252,31,255,248,31,255,240,31,
255,224,31,255,192
110 DATA
31,255,0,31,252,0,31,240,0,31,224,0,31,128,0,
31,240,0
120 DATA
31,255,192,28,255,224,28,127,240,28,15,248,30,
0,252,31,0,126
130
DATA
15,128,15,7,192,7,3,240,7,1,254,7,0,255,7,0,
127,135
140 DATA
0,31,199,0,7,231,0,1,247,0,0,255,0,0,127,0,0,63
In this program, line 20 assigns the graphics option (24-pin triple-
density) with code
39.
Code 42 sets the number of pin columns at
42.
Lines
80-140
contain 126 bytes of data (42 pin columns x 3 bytes for
each pin column). Lines 30-60 print the design that you see below.
Notice that the dots overlap quite a bit. This design was printed
using the triple-density 24-pin graphics option because the density is
the same (180 dots to the inch) in both directions.
Adding the following lines to the program above will cause the
pattern to print 10 times in a row as shown below.
15
FOR C=l TO 10: RESTORE
65
NEXT C
6-9