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Routines |
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Used by the routine at ReadControls.
Reads the Kempston joystick.
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| ReadKempstonJoystick | B0B4 | IN A,($1F) | Read the joystick. | |
| B0B6 | LD C,$00 | Clear the controls. | ||
| B0B8 | BIT 0,A | Jump if the joystick is not pushed right. | ||
| B0BA | JR Z,ReadKempstonJoystick_Left | |||
| B0BC | SET 0,C | Set the bit for turning right. | ||
| ReadKempstonJoystick_Left | B0BE | BIT 1,A | Jump if the joystick is not pushed left. | |
| B0C0 | JR Z,ReadKempstonJoystick_Down | |||
| B0C2 | SET 1,C | Set the bit for turning left. | ||
| ReadKempstonJoystick_Down | B0C4 | BIT 2,A | Jump if the joystick is not pushed down. | |
| B0C6 | JR Z,ReadKempstonJoystick_Up | |||
| B0C8 | SET 6,C | Set the bit for the action key. | ||
| ReadKempstonJoystick_Up | B0CA | BIT 3,A | Jump if the joystick is not pushed up. | |
| B0CC | JR Z,ReadKempstonJoystick_Fire | |||
| B0CE | SET 2,C | Set the bit for moving forward. | ||
| ReadKempstonJoystick_Fire | B0D0 | AND $10 | Jump to finish if the fire button is not pressed. | |
| B0D2 | JR Z,FinishJoystickControls | |||
| B0D4 | SET 3,C | Set the bit for firing the second weapon. | ||
| B0D6 | JP FinishJoystickControls | Jump to finish. | ||
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View the equivalent code in;
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