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Routines |
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Used by the routine at GoldfishGame_PlayerControls.
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| Controls_KempstonJoystick | 54620 | IN A,(31) | Read from the Kempston joystick port. | |
| 54622 | PUSH AF | Stash the control on the stack. | ||
| 54623 | AND %00000010 | Keep only bit 1. | ||
| 54625 | CALL NZ,GoldfishGame_PlayerMoveLeft | Call GoldfishGame_PlayerMoveLeft if left has been pressed. | ||
| 54628 | POP AF | Restore the current control but keep it on the stack. | ||
| 54629 | PUSH AF | |||
| 54630 | AND %00000100 | Keep only bit 2. | ||
| 54632 | CALL NZ,GoldfishGame_PlayerMoveDown | Call GoldfishGame_PlayerMoveDown if down has been pressed. | ||
| 54635 | POP AF | Restore the current control but keep it on the stack. | ||
| 54636 | PUSH AF | |||
| 54637 | AND %00001000 | Keep only bit 3. | ||
| 54639 | CALL NZ,GoldfishGame_PlayerMoveUp | Call GoldfishGame_PlayerMoveUp if up has been pressed. | ||
| 54642 | POP AF | Restore the current control from the stack. | ||
| 54643 | AND %00000001 | Keep only bit 0. | ||
| 54645 | JP NZ,GoldfishGame_PlayerMoveRight | Jump to GoldfishGame_PlayerMoveRight if right has been pressed. | ||
| 54648 | RET | Return. | ||
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