627



627            273            PADDL3

628            274            PADDL4

629            275            PADDL5

630            276            PADDL6

631            277            PADDL7

632            278            STICK0
     The value of joystick 0. STICK registers are shadow locations for
     PIA locations 54016 and 54017 ($D300, $D301). There are nine
     possible decimal values (representing 45 degree incrememts)
     read by each joystick register (using the STICKn command),
     depending on the position of the stick:

     Decimal                   Binary
               14                       1110
                |                         |
            10  | 6                 1010  | 0110
              \ |/                      \ |/
          11-- 15 ---7           1011-- 1111 --0111
              / |\                      / |\
             9  | 5                 1001  | 0101
                |                         |
               13                       1101

     15 (1111) equals stick in the upright (neutral) position.
     See Micro, December 1981,for an article on making a
     proportional joystick. For an example of a machine language
     joystick driver you can add to your BASIC program, see
     COMPUTE!, July 1981.
     One machine language joystick reader is listed below, based on
     an article in COMPUTE!, August 1981:

     1   GOSUB 1000
     10  LOOK = STICK(0)
     20  X = USR(1764,LOOK): Y = USR(1781,
         LOOK)
     30  ON X GOTO 120, 100, 110
     .
     .
     .
     100 REM YOUR MOVE LEFT ROUTINE HERE
     105 GOTO 10
     110 REM YOUR MOVE RIGHT ROUTINE HERE
     115 GOTO 10