Printing Simple Patterns - Epson LX-810 User Manual

Graphics

Printing simple patterns

The first example is just a simple program to show you how a
graphics command, column reservation numbers, and data can be
used in a BASIC program.
Type in and run the following program; be especially careful to
include all semicolons. The program produces the printout you see
below.
10 WIDTH "LPT1:",255
20 LPRINT CHR$(27);"*n ;cHR$(O);CHR$(4O);cHR$(o);
50 NEXT X
Line 20 specifies single-density graphics mode and also reserves 40
columns for 'graphics. Line 30 begins a loop to supply 140 bytes of
data. Line 40 contains the number 170, which produces the first
pin pattern shown in the section on pin labels, and line 50 finishes
the loop.
Note: Some software programs (including most version of
BASIC) automatically insert carriage return and line feed codes
after every 80 or 130 characters. This is usually no problem with
text, but it can spoil your graphics. For every CR-LF pair
inserted in your program, two extra columns of graphics are
printed in the middle of the ones you send, and two data
numbers are left over and printed as text.
In some versions of BASIC you can prevent this unwanted
control code insertion by putting a WIDTH statement at the
beginning of all graphics programs. The format in many forms
of BASIC is either WIDTH "LPT1:", 255 or WIDTH LPRINT
255. Check your software manual for the proper format.
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Software and Graphics