JOY (BASIC 3.5)
| BASIC keyword | |
| Keyword: | JOY |
| Abbreviation: | J Shift+O |
| Type: | Function |
| Token code: | 207/$CF |
| Handling routine in BASIC ROM: |
33283-33356 $8203-$824C |
| List of all BASIC keywords | |
Remark: This article describes the BASIC function JOY in Commodore BASIC V3.5 or higher.
Type: Numeric Function General Programming-Syntax: JOY(<numeric-expression>)
The JOY command is a BASIC v7 function, used for reading the status of the joysticks.
The numeric expression must be 1 or 2, referring to the two joystick ports. Using any other number generates an ?ILLEGAL QUANTITY ERROR.
The output of JOY is different from the old PEEK 56320/56321 statements- JOY returns 0 when no button is pressed, or one of the following:
8 |
UP 1 |
2 |
| LEFT 7 |
RIGHT 3 | |
6 |
DOWN 5 |
4 |
The most-significant bit is also activated when the fire button is pressed, so fire-down alone returns 128, or 128 added to the numbers above.
Examples[edit | edit source]
? JOY(2)
Printing out position of joystick in port 2 on screen.
5 J1=JOY(1) 6 IF J1>=128 THEN J1=J1-127+8 7 ON J1 GOSUB 11,12,13,14,15,16,17,18,20,21,22,23,24,25,26,27,28 8 GOTO 5 11 PRINT "N" : RETURN 12 PRINT "NO": RETURN 13 PRINT "O" : RETURN 14 PRINT "SO": RETURN 15 PRINT "S" : RETURN 16 PRINT "SW": RETURN 17 PRINT "W" : RETURN 18 PRINT "NW": RETURN 20 PRINT "FIRE": RETURN 21 PRINT "FIRE + N ": RETURN 22 PRINT "FIRE + NO": RETURN 23 PRINT "FIRE + O ": RETURN 24 PRINT "FIRE + SO": RETURN 25 PRINT "FIRE + S ": RETURN 26 PRINT "FIRE + SW": RETURN 27 PRINT "FIRE + W ": RETURN 28 PRINT "FIRE + NW": RETURN
Never ending joystick routine for all 18 positions of the joystick in port 1 (break with RUN/STOP ).
ABS | ASC | ATN | AUTO | BACKUP | BOX | CHAR | CHR$ | CIRCLE | CLOSE | CLR | CMD | COLLECT | COLOR | CONT | COPY | COS | DATA | DEC | DEF | DELETE | DIM | DIRECTORY | DLOAD | DO | DRAW | DS | DS$ | DSAVE | END | EL | ELSE | ER | ERR$ | EXIT | EXP | FN | FOR | FRE | GET | GET# | GETKEY | GOSUB | GOTO | GRAPHIC | GSHAPE | HEADER | HELP | HEX$ | IF | INPUT | INPUT# | INSTR | INT | JOY | KEY | LEFT$ | LEN | LET | LIST | LOAD | LOCATE | LOG | LOOP | MID$ | MONITOR | NEW | NEXT | ON | OPEN | PAINT | PEEK | POKE | POS | PRINT | PRINT USING | PRINT# | PUDEF | RCLR | RDOT | READ | REM | RENAME | RENUMBER | RESTORE | RESUME | RETURN | RGR | RIGHT$ | RLUM | RND | RUN | SAVE | SCALE | SCNCLR | SCRATCH | SGN | SIN | SOUND | SPC | SQR | SSHAPE | STOP | STR$ | SYS | TAB | TAN | TRAP | TROFF | TRON | UNTIL | USR | VAL | VERIFY | VOL | WHILE | WAIT
