Epson P-80 User Manual download pdf (Page 35)

following chart shows many different ways of referring to the code for

the carriage return function.

Carriage return

Its common name

The abbreviation of its name

The decimal ASCII code

0DH Its hexadecimal ASCII code

CTRL/M

Its control-code name

CHR$(13)

Its usage in BASIC

As you can see there are many different ways to refer to a single

code. This information helps you identify what code is being

referenced. Your computer manual may refer to ASCII 13 while your

software program refers to CTRL/M. You now know that both refer

to the same code.

ASCII Codes as CHR$(n)

The ASCII codes take on a new form when you use them with

programming languages. For example, in BASIC, the ASCII codes

take the form of CHR$(n), where n represents the desired code. The

capital letter A, which is the ASCII code 65, is CHR$(65). You are

telling the computer which code you want by inserting the number

within the parentheses following the CHR$. Depending on the code,

you instruct your printer to print a character, or perform a function

(such as execute a line feed or print italics).

The ESCape code

So many features have been added to printers that even 256 ASCII

codes are inadequate if only single-code CHR$ instructions can be

used. Because of this, the logic of the P-80 has been designed to under-

stand special sequences of control codes, the ESCape code sequences.

This permits major expansion to the availability of control codes.

Each ESCape code sequence consists of the ESCape code (usually

abbreviated (ESC)), which is

CHR$(27),

plus one or more of the

other P-80 CHR$ codes. You use these code sequences to select one or

more printing features, or modes.

For example, the ESCape code used to turn the italic print function

on is <ESC>“4”. The (ESC) is the abbreviation for CHR$(27) and the

numeral

is the ASCII equivalent of CHR$(52). The <ESC>“4” is eas-

ier to remember than

CHR$(27)CHR$(52).

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Epson P-80 User Manual Page 35

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