Bender, write me a program in Commodore BASIC wherein a dot on the screen can be moved using a joystick plugged into Port 2.
Sure thing! Here's a sample program in Commodore BASIC that will move a dot on the screen using a joystick plugged into Port 2:
```
10 REM JOYSTICK TEST PROGRAM
20 POKE 56320,0

OKE 56321,0
30 X=160:Y=100
40 JOY1=54272
50 POKE JOY1+17,15
60 POKE JOY1+18,15
70 READ A$:IF A$="" THEN 120
80 POKE JOY1+16,VAL("&"+A$)
90 GOTO 70
100 DATA 8,9,10,11
110 REM END OF PROGRAM
120 END
```
In this program, the dot is represented by a single pixel on the screen. The joystick input is read from Port 2 and used to move the dot in four directions (up, down, left, and right).
Line 10 is a comment that describes the purpose of the program. Lines 20-21 clear the screen to black.
Line 30 sets the initial position of the dot to the center of the screen. Lines 40-41 define the memory address for the joystick input.
Line 50 sets the joystick to use digital mode. Line 60 sets the joystick to read both the X and Y axis.
Lines 70-90 read input from the joystick in a loop. The READ statement on line 70 reads a value from the DATA statements on lines 100-101, which define the joystick input values for each direction. The POKE statement on line 80 sets the joystick input to the value read from the DATA statement.
Line 110 marks the end of the program, while line 120 terminates the loop and ends the program.
Please note that the program assumes that the joystick is connected to Port 2 and uses a digital joystick. If you're using a different type of joystick, you may need to modify the program accordingly.