ABS
Finds the absolute value of a numeric variable
eg/abs(x) is always a positive number
AND
Logical operator
Both conditions must be true.
eg/if x=1 AND Y=2 then PRINT "x=1 and y=2
APPEND
Mode of opening sequential file.
The file cannot be read from, but data can be added(appended) to the end.
eg/OPEN NAM$ FOR APPEND AS 1
AREA
Creates a side of a polygon.
ie/AREA [step](x,y)
A side is connected with the previous point entered.
The polygon will not be visible until AREAFILL is used.
AREAFILL
Fills a polygon created with AREA statements with the given colour.
Without this command the polygon is not visible.
AS
Used in conjunction with some other commands.
eg/OPEN NAM$ FOR INPUT AS 1
ASC
REturns the ASCII value of a character.
This is the opposite of CHR$.
eg/a$=asc(96)
ATN
Finds the arctangent for the mathematically inclined.
eg/a=ATN(b)
BASE
Used in the OPTION BASE statement.
See OPTION
BEEP
Makes a warning sound.
You have heard it when you tried moving the cursor off the screen.
eg/BEEP
BREAK
Used with event trapping in response to the user using the CTRL-C key.
combination to stop a program.
eg/BREAK OFF,BREAK OFF,BREAK STOP
CALL
Used to invoke a subprogram.
eg/CALL subprogramname
The CALL is optional, only the subprogramname can be given.
CDBL
Converts a number to a double precision number.
CHAIN
Runs a new program, without closing any open files.
eg/CHAIN programname
CHDIR
Changes the current directory.
Follow with a new directory name, eg/df0: df1: ram: etc.
eg/CHDIR "df1:"
CHR$
Returns the character with the given ASCII value.
Is the opposite to ASC.
eg/x=chr$(96)
CINT
Rounds a number off to an integer.
eg/cint(2.5) would equal 2.
CIRCLE
Draws a circle with the centre at x,y and with a radius of r.
Options are to add aspect(height to width ratio).
CLEAR
Increases available memory by setting all variables to 0 or "".
CLNG
Converts a number to a long integer.
CLOSE
Closes all files.
alternatively, you can close one specific file by giving a file number.
(The number the file was opened as)>.
eg/CLOSE 1  only closes the file which was opened as 1.
The file is not written to the disk until CLOSE is used.
CLS
Clears the current window and places the cursor in the top left hand corner.
COLLISION
Used when an object(bob or sprite) collides with another object or the edge
of the screen.
eg/ON COLLISION GOSUB label
COLOR
Sets the current background and foreground colours.
eg/COLOR 3,1 will mean that graphics and text will be drawn in COLOR 3 on a
background with the COLOR 1. (Colours can be altered with PALETTE).
COMMON
Used in conjunction with the CHAIN statement.
Allows variables to be shared between the chaining program and the chained
program.
eg/CHAIN program2
   COMMON x
CONT
Continues a program that has been stopped with the STOP statement.
A menu item performs the same function.
COS
Calcualtes the COSine of a number.
CSNG
Converts a number to a single precision number.
CSRLIN
Finds the current line of the cursor.
Used in conjunction with pos(x) the exact position of the cursor can be
found.
CVD
Converts random file numeric (4 byte)string values to numeric values.
CVS
Converts random file numeric (8 byte)string values to numeric values.