| ADR | HEXADR | NAME | Description | shadow | OS |
|---|---|---|---|---|---|
| 54017 | $D301 | PORTB | STICK2 STICK3 PTRIG4 PTRIG5 PTRIG6 PTRIG7 | all |
Read or write data from the control ports (joystick ports), depending on how the data direction is set (default: 0 "read/input"). To set the direction, set Bit 2 of PACTL to "0" and define the direction by setting the bits of PORTA (0=read, 1=write) for each input/output line. Then set Bit 2 of PACTL to "1" again.
Example:
PACTL=PACTL && %11111011 ;set Bit 2 to 0 PORTA=%11110000 ;set Port 2 to output/write, Port 1 is input/read PACTL=PACTL %% %00000100 ;set Bit 2 to 1
| Bit | Function | Description | Joystick direction | Paddletrigger |
|---|---|---|---|---|
| 7 | PA7 | Joystick Port 4 Pin 4 | Right | Paddle 8 PTRIG7 |
| 6 | PA6 | Joystick Port 4 Pin 3 | Left | Paddle 7 PTRIG6 |
| 5 | PA5 | Joystick Port 4 Pin 2 | Down | not used |
| 4 | PA4 | Joystick Port 4 Pin 1 | Up | not used |
| 3 | PA3 | Joystick Port 3 Pin 4 | Right | Paddle 6 PTRIG5 |
| 2 | PA2 | Joystick Port 3 Pin 3 | Left | Paddle 5 PTRIG4 |
| 1 | PA1 | Joystick Port 3 Pin 2 | Down | not used |
| 0 | PA0 | Joystick Port 3 Pin 1 | Up | not used |
Joystick direction sets Bit=0 when pushed in that direction
Paddletrigger Bit=0 when pressed