Table of Contents
Advertisement
2810 DATA 255,255,255,255,143,
15.
7,
7.
7.
7
2820 DATA
3.
3,
3,131,193,241,240.240,
0.
0
2830 DATA
0.
0,
0,
0,
0,
0,
0,
0,
0,
0
2840 DATA
0, 31, 31,
3,129,128,192.192,192,192
2850 DATA 192,224,224,224.224.240.255.255,255,255,255
2860 DATA 255,127,
0,
0.
0.
0, 63,127,255.255
2870 DATA 255,255.193.128,128,128,128,192~224,240
2880 DATA 252,255,255,255,127,
63, 31,
7.
7, 31
2890 DATA 254,252,248,224,128.
0.
0.
3,
7.
7
2900 DATA
7.
3,
0.
0.
0,
0,
0, 31, 31,
3
2910 DATA 129,128,192.192,192,192.224.224.224
2920 DATA 224,240.255.255,255.255,255.127.
0,
0
2930 DATA
0,
0.
0,
0,
0,
0,
0.
0,
0.
0
2940 DATA
0,248,248,240,224,224,112,112,
56. 56
2950 DATA
56, 56, 56.120,120.240,240.224,224.192
2960 DATA 128,
0.
0,
0,
0.
0,192,224,240,240
2970 DATA 240,248,248.248.120.120,
56, 56, 56. 56
2980 DATA
48,112,224.224,224,224,240.240,240,248,248
2990 DATA 120,120,
56. 56, 56. 56,120.240.224.224
3000 DATA 192,128,
0,
0.
0.
0.
0,248,248,240
3010 DATA 224,224,112.112.
56. 56. 56. 56, 56,120
3020 DATA 12o,240,240,224,224.192,128,
0,
0.
0
3030 DATA
0,
0,
0,
0.
0,
0,
0,
0.
0.
0
How the program
works
This program
begins
by assigning
a number
of printer
commands
to
BASIC
string
variables
(lines
1000 to 1090). You can find most of these
commands
near the beginning
of Appendix
B.
The WIDTH
"LPTl:"
255 statement
in line 1110 means
infinite
line
width.
It prevents
the IBM-PC
from inserting
unwanted
carriage
returns
and line feeds in graphics
data.
Actual
printing
begins in line 1120. Using the preassigned
commands,
the program
prints
samples
of its different
type styles,
including
a line
showing
all styles in italics,
followed
by samples
of the print pitches,
then
some double
and quadruple-sized
printing.
Next comes the central
attraction
of the program:
a line of text printed
twenty
times in expanding
and contracting
loops to give a barrel
effect.
The work is done by four printer
commands:
a command
setting
the right
margin
(line 1400); a centering
command
(line 1420); a command
to vary
the line spacing
(lines 1440 and 1490); and a command
to micro-adjust
the
space between
characters
(lines 1450 and 1500).
44
- Quick Links:
- Connect the Printer to the Computer
Hide quick links:
Advertisement
Table of Contents
