Using The Printer As A Pascal File; Interface Commands In Pascal; Screen Dumps; Using The Printer Withcp/M - Epson 8133 User Manual

New apple ii intelligent parallel interface

Table of Contents

USING THE PRINTER AS A PASCAL FILE

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The process of printing from a PASCAL program is different from

BASIC: you have to direct each item of data to be sent to the printer

specifically to that device. The printer then becomes an output file.

First it is necessary to declare an internal identifier for the printer file,

making its type either TEXT or INTERACTIVE. Open the file using

REWRITE, supplying the name PRINTER:, and then either WRITE or

WRITELN statements can be used to carry out the printing. The

following short program will accept input from the keyboard and print

it on the printer:

PROGRAM PATOUT;

VAR

EPSON

: INTERACTIVE;

WORDS

: STRING;

BEGIN

READLN(WORDS);

REWRITE(EPSON, 'PRINTER:');

WRITELN(EPSON, WORDS, 'WAS THE TEXT YOU INPUT.');

END.

Since the printer is not a block-structured device, you cannot use

BLOCKWRITE. You can, however, use UNITWRITE - consult the

APPLE PASCAL LANGUAGE REFERENCE MANUAL for the full

details of its use.

Remember that, if you are using WRITE instead of WRITELN, no

carriage return is sent to the printer. You will not see any text printed

by the printer until either the printer's buffer is full or a carriage return

is sent to empty it. Thus you should ensure at the end of your program

that either a carriage return is sent as the last character, or that a

WRITELN statement is used.

INTERFACE COMMANDS IN PASCAL

Using the commands in PASCAL is the same as described in the

rest of the manual, except that <CTRL>-Y is used instead of <CTRL>-1.

SCREEN DUMPS

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Both text and graphics screen dumps can be performed in the usual

way using the <CTRL>-Y nS and <CTRL>-Y G commands respectively.

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USING THE PRINTER

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WITHCP/M

As with PASCAL, using the #8133 interface with CP/M is slightly

different from using it with BASIC. The interface should go into

slot # I. The normal way to direct output to the printer is to use

<CTRL>-P as a toggle. The CP/M documentation gives full details, as

does the documentation for any applications programs.

If you are using MBASIC or GBASIC, the commands are used as