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Routines |
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Used by the routines at Show_Game_Over and Show_Ending_Screen.
Waits until key 0 is pressed. It gives up after 12 times 65536 passes round the inner loop if no key is pressed.
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| Wait_For_Key | 38387 | LD B,12 | Set the outer counter to 12. | |||||||||||||||||
| 38389 | LD HL,0 | Set the inner counter to 0 which makes 65536 passes round the inner loop. | ||||||||||||||||||
| Wait_For_Key_Inner_Loop | 38392 | DEC HL | Decrease the inner counter. | |||||||||||||||||
| 38393 | LD A,239 | Read from the keyboard;
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| 38395 | OUT (253),A | |||||||||||||||||||
| 38397 | IN A,(254) | |||||||||||||||||||
| 38399 | AND %00000001 | Keep only the bit for key 0. | ||||||||||||||||||
| 38401 | RET Z | Return if key 0 is pressed. | ||||||||||||||||||
| 38402 | LD A,H | Jump back to Wait_For_Key_Inner_Loop until the inner counter is zero. | ||||||||||||||||||
| 38403 | OR L | |||||||||||||||||||
| 38404 | JR NZ,Wait_For_Key_Inner_Loop | |||||||||||||||||||
| 38406 | DJNZ Wait_For_Key_Inner_Loop | Decrease the outer counter and loop back until it is zero. | ||||||||||||||||||
| 38408 | RET | Return. | ||||||||||||||||||
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