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Routines |
| Prev: B881 | Up: Map | Next: B8A9 |
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Used by the routines at GameOver and GameCompleted.
Waits until a key is pressed or a time has passed. The time is B counts of HL from 0000 back to 0000.
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Count down, reading the keyboard each time.
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| WaitForKeyPress | B899 | LD HL,$0000 | Set HL to 0000. | |||||
| WaitForKeyPress_Wait | B89C | XOR A | Select all of the keyboard rows. | |||||
| B89D | CALL ReadKeyboardPort | Call ReadKeyboardPort. | ||||||
| B8A0 | RET NZ | Return if a key is pressed. | ||||||
| B8A1 | DEC HL | Count down. | ||||||
| B8A2 | LD A,H | Jump to WaitForKeyPress_Wait if HL is not zero. | ||||||
| B8A3 | OR L | |||||||
| B8A4 | JR NZ,WaitForKeyPress_Wait | |||||||
| B8A6 | DJNZ WaitForKeyPress_Wait | Jump to WaitForKeyPress_Wait. | ||||||
| B8A8 | RET | Return. | ||||||
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View the equivalent code in;
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| Prev: B881 | Up: Map | Next: B8A9 |