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ESCape and ASCII
The details of printer-computer communication are complex, but
for most purposes all you need to know is that the computer sends a
series of codes (each consisting of one or more numbers) to the printer,
and the printer interprets them.
Some codes tell the printer to print a character, and other codes tell
it to turn on or off certain printer functions, such as emphasized or
Near Letter Quality. Because the codes between 0 and
cally standardized by the American Standard Code for Information
Interchange (ASCII) they are referred to as ASCII numbers in this
manual.
Nearly all of the codes for printer functions require more than one
number and begin with a special code, called the escape code. This
code signals that the next number is a code for a printer function and
its name is usually printed with the first three letters capitalized
(Escape) or it is abbreviated ESC or (ESC) .
In the demonstration programs in this manual, you'll see how
ASCII and ESCape codes are used in the BASIC programming lan-
guage.
LPRINT signals that information is to be sent to the printer.
l
The CHR$ (character string) function is used for numerical codes.
l
is the ESCape code.
CHR$(27)
l
Quotation marks are used for printable characters, such as letters of
l
the alphabet.
Your word processing or business program may use other methods
to send those codes, such as pressing the
code. See your software manual for further information and use
Appendixes A and B of this manual to find the proper codes. Appen-
dix E also has some suggestions on using LX-90 features with applica-
tions software.
16
127
key for the ESCape
ESC
are basi-
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