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INKEY$
Chapter 2 Program Instructions
Field of Application Function reading the first character in the receive buffer of the standard
IN channel.
Syntax INKEY$
Remarks For information on standard I/O channels, see SETSTDIO statement. By
default, "uart1:" is the standard I/O channel.
As opposed to the INPUT statement, INKEY$ does not interrupt the program
flow to wait for input data, unless a loop is created by means of a GOTO
statement, see line 20 in the example below.
INKEY$ is useful when the host computer is unable to end the input data with
a “Carriage Return” (CR; ASCII 13 dec.)), but must use some other character,
e.g. “End of Text” (ETX; ASCII 3 dec.). Then a routine, which interprets the
substitute character as a carriage return, can be created.
Example In this example, none of the characters received on the std. IN channel will
be printed on the screen of your terminal until a # character (ASCII 35
decimal) is encountered.
10 A$ = INKEY$
20 IF A$ = "" GOTO 10
30 IF A$ = CHR$(35) THEN PRINT B$
40 IF A$ = CHR$(35) THEN END
50 B$ = B$ + A$
60
RUN
GOTO 10
Type a number of characters on your terminal's keyboard. They will not be
printed on the screen until you type a # character. Then all the characters will
appear simultaneously, except for the #-sign.
Note the loop between line 10 and 20, which makes the program wait for you
to activate a key.
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