Atari BASIC Keywords
| ABS | Returns the absolute value of a number |
| ADR | Returns the address in memory of a variable (mostly used for machine code routines stored in variables) |
| AND | Logical conjunction |
| ASC | Returns the ATASCII value of a character |
| ATN | Returns the arctangent of a number |
| BYE | Transfers control to the internal "Self Test" program ("Memo Pad" on early models) |
| CHR$ | Returns a character given an ATASCII value |
| CLOAD | Loads from cassette tape a tokenized program that was saved with CSAVE |
| CLOG | Returns the common logarithm of a number |
| CLOSE | Terminates pending transfers (flush) and closes an I/O channel |
| CLR | Clears variables' memory and program stack |
| COLOR | Chooses which logical color to draw in |
| COM | Implementation of MS Basic's COMMON was cancelled. Recognized but the code for DIM is executed instead |
| CONT | Resumes execution of a program after a STOP at the next line number (see STOP) |
| COS | Returns the cosine of a number |
| CSAVE | Saves to cassette tape a program in tokenized form with fast method (short inter-record gap on tape) (see CLOAD) |
| DATA | Stores data in lists of numeric or string values |
| DEG | Switches trigonometric functions to compute in degrees (radians is the default mode) (see RAD) |
| DIM | Defines the size of a string or array (see COM) |
| DOS | Transfers control to the Disk Operating System (DOS); if DOS was not loaded, same as BYE |
| DRAWTO | Draws a line to given coordinates |
| END | Finishes execution of the program, closes open I/O channels and stops any sound |
| ENTER | Loads and merges into memory a plain text program from an external device, usually from cassette tape or disk (see LIST) |
| EXP | Exponential function |
| FOR | Starts a for loop |
| FRE | Returns the amount of free memory in bytes |
| GET | Reads one byte from an I/O channel (see PUT) |
| GOSUB | Jumps to a subroutine at a given line in the program, placing the return address on the stack (see POP and RETURN) |
| GOTO and GO TO | Jumps to a given line in the program. GOTO can be omitted in "IF ... THEN GOTO ..." |
| GRAPHICS | Sets the graphics mode |
| IF | Executes code depending on whether a condition is true or not |
| INPUT | Retrieves a stream of text from an I/O channel; usually data from keyboard (default), cassette tape or disk |
| INT | Returns the floor of a number |
| LEN | Returns the length of a string |
| LET | Assigns a value to a variable. LET can be omitted |
| LIST | Lists (all or part of) the program to screen (default), printer, disk, cassette tape, or any other external device (see ENTER) |
| LOAD | Loads a tokenized program from an external device; usually a cassette tape or disk (see SAVE) |
| LOCATE | Stores the logical color or ATASCII character at given coordinates |
| LOG | Returns the natural logarithm of a number |
| LPRINT | Prints text to a printer device (same result can be achieved with OPEN, PRINT and CLOSE statements) |
| NEW | Erases the program and all the variables from memory; automatically executed before a LOAD or CLOAD |
| NEXT | Continues the next iteration of a FOR loop |
| NOT | Logical negation |
| NOTE | Returns the current position on an I/O channel |
| ON | A computed goto - performs a jump based on the value of an expression |
| OPEN | Initialises an I/O channel |
| OR | Logical disjunction |
| PADDLE | Returns the position of a paddle controller |
| PEEK | Returns the value at an address in memory |
| PLOT | Draws a point at given coordinates |
| POINT | Sets the current position on an I/O channel |
| POKE | Sets a value at an address in memory |
| POP | Removes a subroutine return address from the stack (see GOSUB and RETURN) |
| POSITION | Sets the position of the graphics cursor |
| PRINT and ? | Writes text to an I/O channel; usually to screen (default), printer, cassette tape or disk (see LPRINT and INPUT) |
| PTRIG | Indicates whether a paddle trigger is pressed or not |
| PUT | Writes one byte to an I/O channel (see GET) |
| RAD | Switches trigonometric functions to compute in radians (see DEG) |
| READ | Reads data from a DATA statement |
| REM | Marks a comment in a program |
| RESTORE | Sets the position of where to read data from a DATA statement |
| RETURN | Ends a subroutine, effectively branching to the line immediately following the "calling" GOSUB (see GOSUB and POP) |
| RND | Returns a pseudorandom number |
| RUN | Starts execution of a program, optionally loading it from an external device (see LOAD) |
| SAVE | Writes a tokenized program to an external device; usually a cassette tape or disk (see LOAD) |
| SETCOLOR | Maps a logical color to a physical color |
| SGN | Returns the signum of a number |
| SIN | Returns the sine of a number |
| SOUND | Starts or stops playing a tone on a sound channel (see END) |
| SQR | Returns the square root of a number |
| STATUS | Returns the status of an I/O channel |
| STEP | Indicates the increment used in a FOR loop |
| STICK | Returns a joystick position |
| STOP | Stops the program, allowing later resumption (see CONT) |
| STRIG | Indicates whether a joystick trigger is pressed or not |
| STR$ | Converts a number to string form |
| THEN | Indicates the statements to execute if the condition is true in an IF statement |
| TO | Indicates the limiting condition in a FOR statement |
| TRAP | Sets to jump to a given program line if an error occurs (TRAP 40000 cancels this order) |
| USR | Calls a machine code routine, optionally with parameters |
| VAL | Returns the numeric value of a string |
| XIO | General-purpose I/O routine (from "Fill screen" to "Rename file" to "Format disk" instructions) |
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