Apple2 Integer Basic Reference

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Apple II Programmer's Reference: Integer Basic Commands

 

 

INTEGER BASIC Reference
Statements and Lines
A line typed without a line number is executed immediately; those lines typed with a line number are saved for execution with the RUN command.
:	Separates multiple statements on the same line.
REM	Designates a remark for comments.
Operations on Whole Programs
NEW	Erases the current program and clears all variables.
CLEAR	Resets all variables.
LIST	Displays the entire current program.
LIST 11-12	Displays the lines from 11 to 12.
RUN	Executes the current program.
RUN n	Executes the current program from line n.
RUN name	Executes the program name from disk.
LOAD name	Loads the program name from disk.
SAVE name	Saves the program on the disk as name.
Variables
Integer	AB	+/- 32767
String	AB$	0 to 255 characters
Where A is a letter, B is a letter or digit.
Arrays
DIM	Allocates space for an array or string.
Arithmetic Operators
=	Assigns a value to a variable
-	Subtraction
+	Addition
/	Division
*	Multiplication
^	Exponentiation
Logical Operators
AND	Both true
OR	Either one or both true
NOT	Is false
Relational Operators
=	Equal to
<	Less than
>	Greater than
<=	Less than or equal to
>=	Greater than or equal to
#	Not equal to
Arithmetic Functions
ABS(x)	Absolute value of x
SGN(x)	-1 if x<0, 0 if x=0, 1 if x>0
RDN(x)	Random number in the range 0 <= r < x
String Operations
LEN(s)	Length of string s
ASC(s)	ASCII code for first character in string s
Control
GOTO n	Branches to line n
IF cond THEN s1	Executes statement if expr is true
FOR v=x TO y STEP z	Begins a loop for all values of v from x to y by z; if step is omitted, 1 is understood.
NEXT v	Repeats loop for next value of v
GOSUB n	Branches to subroutine at line n
RETURN	Returns to point of call from a subroutine
POP	Removes one address from the return stack
STOP	Halts program and print line number
CON	Resumes program execution
END	Halts program execution
Utility Statements
PEEK(addr)	Value of memory location addr
POKE addr,x	Sets memory location addr to x
CALL addr	Executes machine language routine at addr
HIMEM:addr	Sets highest available memory to addr
LOMEM:addr	Sets lowest available memory to addr.
TRACE	Displays the number of each executed line
NOTRACE	Turns line numbering off
DSP v1,v2..	Displays v1,v2...each time they change.
Graphics
GR	Sets lores graphics mode and clears screen
COLOR=x	Sets lores drawing color to x
PLOT x,y	Draws a dot at location x,y
HLIN x1,x2 at y	Draws a horizontal line from x1,y to x2,y
VLIN y1,y2 at x	Draws a vertical line from x,y1 to x,y2
SCRN(x,y)	The color of the dot at location x,y.
Input/Output
IN# n	Re-directs input from slot n
INPUT s;x,y	Prompts with string s, then reads x,y.
PDL(n)	Value of paddle n, either 0 or 1
PR# n	Re-directs output to slot n
PRINT x,y,...	Prints strings or values
TEXT	Sets text mode
VTAB n	Sets vertical position to n