Star Micronics NB24-10/15 user manual Demo of ASCII code 20 LPRINT CHR$7 30 END RUN

Models: NB24-10/15

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10 ' Demo of ASCII code

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-the “control” key and one other. The other key determines what code is sent - pressing the control (CTRL) key and A sends ASCII code 1, CTRL B sends ASCII code 2, and so on. Your printer has a lot of control codes to let you do some useful things. Let’s try one that we’ve mentioned several times

already:

10 ' Demo of ASCII code

20 LPRINT CHR$(7)

30END

RUN

That’s the printer’s bell (we call it that even though it sounds like a buzzer). We’ll learn more about it in later - we just wanted to show you a control code that would get your attention right away!

There are four common ways of referring to a control code: the name of the code or its abbreviation, the decimal ASCII value, the hexadecimal ASCII value, and the “CTRL-” value. For example, the ASCII code that causes the printer to advance the paper one line is decimal 10. This code may be referred to by any of the following:

line feed

-

the

name

of the

code

(LF)

 

-

its

abbreviation

 

 

ASCII

10

-

its

decimal value

 

ASCII

&HOA

-

its hexadecimal

value (the &H signifies

 

 

 

hex)

 

 

 

CHR$(lO)

-

the

way

it’s used

in BASIC

CTRL- J

-

the

way

you send

it from a keyboard

Of course, most of the time we don’t need to bother with these. The computer is smart enough to know that when we press the “A” key we want to print the letter “A” - it takes care of all the intermediate steps.

Appendix C is a table that shows the various names for each code so you can convert back and forth. The microcomputer world is not very consistent in describing ASCII codes, so it’s important that you have a basic knowledge of them.

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Image 55
Star Micronics NB24-10/15 user manual Demo of ASCII code 20 LPRINT CHR$7 30 END RUN