Remote-processing BASIC 52 Manual do Utilizador descarregar pdf (Página 84)

RPBASIC-52 PROGRAMMING GUIDE

2-65

NULL

Syntax: NULL integer

Where: integer = 0 -255

Function: Sets number of NULL cha racters output to user after a carriage return

Mode: Command

Use: NULL 100

Cards: All

DESCRIPTION

The N ULL comman d cont rols how many NU LL characters (00H) are output follow ing a carriage return.

After a reset, N ULL = 0. Because this is a com man d mode com man d, it cannot be used as part of a program.

The NULL count is stored at external data memory location 15H. Change the value of NULL in a program

using the DB Y(21)=expr instruction, where expr is any value between 0 and 255. No error is returne d if it is

greater than 255.

NULL is generally needed only if you have a slow printer connected to the serial printer port. Note that

NULL affects all serial ports.

Some terminal programs will advance the cursor when a null character is received. This may result in an

strange looking display.

LIST, PRINT

ERROR

BAD SYNTAX When integer is negative.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 162 163

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Remote-processing BASIC 52 Manual do Utilizador Página 84