Basic Functions

Index to Basic Functions

Function	Type	Description
ABS	Function	Returns absolute value of argument
ARG	Function	Sets up argument for CALL
ASC	Function	Returns decimal equivalent of string
ATN	Function	Returns Arc-Tangent of argument
BEEP	Command	Generates tone from sound generator
CALL	Statement	Calls machine-code subroutine
CHAR	Function	Specific character set in graphics mode
CHR$	Function	Returns string equivalent of argument
CIRCLE	Statement	Draws circle on LCD
CLEAR	Command	Clears all variables
CLOSE	Statement	Closes files
CLS	Command	Clears the display screen
COM	Command	Activates/deactivates communications interrupt
CONT	Command	Continues execution of program
COS	Function	Returns cosine of argument
CRT	Command	Switches console to RS-232 port
CUROFF/CURON	Command	Switches cursor off and on
DATA	Statement	Holds data for use by program
DATE$	Function	Returns current date string
DAY$	Function	Returns current day string
DEFSEG	Command	Defines RAM page
DELETE	Command	Delete program lines
DIM	Statement	Initialises arrays
EDIT	Command	Enters Basic editor
END	Statement	Terminates execution
EOF	I/O Function	Detects end of file
ERR/ERL	Function	Returns error code/line number
ERROR	Statement	Simulates Basic error
EXP	Function	Returns e to the power of the argument
FILES	Command	Displays current files
FIX	Function	Strips argument to integer
FOR	Statement	Starts FOR…NEXT loop
FRE	Statement	Returns number of free bytes
GOSUB	Statement	Branches to subroutine
GOTO	Statement	Branches to alternative line
HELP	Statement	Initialises HELP key text pointer
IF	Statement	Conditional branch
IF…THEN…ELSE	Statement	Conditionally executes one of two statements
INCHR	I/O Statement	Returns single character from keyboard
INKEY	I/O Statement	Returns keyboard status
INKEY$	I/O Statement	Returns single character from keyboard if input pending
INP	I/O Statement	Returns value at port address
INPUT	Statement	Returns data input from keyboard
INPUT USING	Statement	Validates data input from keyboard
INPUT	I/O Statement	Input data from file
INSTR	Function	Returns position of second string in first string
INT	Function	Returns integer part of argument
JSR$	Function	Returns fixed-field string
KEY	Command	Initialises soft keys
KEY(n)	Command	Activates/deactivates soft keys
KILL	Command	Deletes file
LEFT$	Function	Returns left part of string
LEN	Function	Returns lengths of string
LET	Statement	Assigns value of variable
LINCHR	I/O Statement	Returns single character from RS-232
LINE	Statement	Draws straight line
LINPUT	I/O Statement	Returns entry from RS-232
LIST	Command	Lists program at LCD
LLIST	I/O Statement	Lists program at RS-232
LLOAD	Statement	Loads program from RS-232
LN	Function	Returns natural logarithm
LOAD	Command	Loads program from file
LOC	I/O Function	Number of records read/written
LOCATE	Command	Sets cursor position
LOG	Function	Returns logarithm to base 10
LOPCHR	I/O Statement	Sends single character to RS-232
LPRINT	I/O Statement	Outputs to RS-232
LTRON	I/O Statement	Sends trace output to RS-232
MAXFILES	I/O Statement	Maximum no. of files to be opened
MID$	Function	Returns mid portion of string
NAME	Command	Re-names file
NEW	Command	Initialises program space
NEXT	Statement	Concludes FOR.. .NEXT loop
ON BREAK	I/O Statement	Vectors program on BREAK key
ON COM	I/O Statement	Vectors program on communication
ON COMMS	I/O Statement	Vectors program on COMMS failure
ON ERROR	Statement	Vectors program on Syntax error
ON…GOSUB…	Statement	Conditional branch to subroutine
ON…GOTO…	Statement	Conditional branch
ON KEY	I/O Statement	Vectors program on soft keys
ON POWER	I/O Statement	Vectors program on POWER key
ON POWER RESUME	I/O Statement	Restarts program on power up
ON TIME$	Statement	Vectors program on system time
OPCHR	Statement	Outputs 1 or more ASCII characters
OPEN	I/O Statement	Opens file for input/output
OUT	I/O Statement	Outputs to specified port
PEEK	Statement	Returns decimal byte value of memory locations
PI	Statement	Value of PI = 3.14159
POINT	Statement	Returns condition of pixel
POKE	Statement	Sets memory location with decimal value
POP	Statement	Returns value from machine code linkage/stack
POS	Statement	Returns cursor position
POWER n	Statement	Specify auto time off
POWER CONT	Command	Disables power off key and time outs
POWER OFF	Command	Switches HUNTER off
POWER OFF, RESUME	Command	Switches HUNTER off
PRINT	Statement	Outputs to LCD
PRINT#	I/O Statement	Output data to file
PSET/PRESET	Statement	Set/re-set pixel
PUSH	Statement	Puts value onto machine code linkage stack
READ	Statement	Returns value from DATA statement
REM	Statement	Enters remarks to Basic text
RESTORE	Statement	Resets Read pointer
RESUME	Statement	Restarts program at specified line
RETURN	Statement	Returns from subroutine
RIGHT$	Function	Returns right portion of string
RND	Function	Produces random number
RUN	Command	Starts a program execution
SAVE	Command	Writes program to file
SCREEN	Command	Changes screen mode
SGN	Function	Returns a value for the sign of its argument
SIN	Function	Returns Sine of argument
SOUND	Command	Generates specified tone
SPACE$	Function	Returns string of spaces
SPC	Function	Prints spaces
SQR	Function	Returns square root of its argument
SRCH	Function	Returns target string array position
STOP	Statement	Terminates program execution
STR$	Function	Returns string equivalent of a numerical argument
STRING$	Function	Returns string of characters
SWAP	Function	Exchange contents of two variables
TAB	I/O Statement	Formats Print output
TAN	Function	Returns tangent of argument
TIME$	Function	Returns current time string
TRON/TROFF	Command	Turns trace on/off
VAL	Function	Returns numeric value of string
VARPTR	Function	Returns address of variable
WAND	Command	Defines wand decode software
WHILE…WEND	Statement	Conditional execution of statements
WINCHR	I/O Statement	Inputs a single character from an optical wand
WINPUT	I/O Statement	Inputs string from optical wand
WRITE#	I/O Statement	Write data to file