
Appendices
545
Communicating with I/Os
Statements
OUT
Sends a data byte to an output port.
POWER
Controls the automatic power-off facility.
WAIT
Pauses program execution until a designated input port
presents a given bit pattern.
Functions
FRE
Returns the number of bytes available in a speci-fied area
of the memory.
INP
Returns a byte read from a specified input port.
Communicating with the barcode device
Statements
CLOSE
Closes file(s).
INPUT #
Reads data from a device I/O file into specified variables.
OPEN "BAR:"
Opens the bar code device file. This statement also
activates or deactivates the indicator LED and the beeper
(vibrator) individually.
Functions
CHKDGT$
Returns a check digit of bar code data.
EOF
Tests whether the end of a device I/O file has been
reached.
INPUT$
Returns a specified number of characters read from the
keyboard or from a device file.
LOC
Returns the current position within a specified file.
MARK$
Returns the bar code type and the number of digits of a
bar code
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