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Routines |
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Used by the routine at GameMenu.
Plays a tune once, and stops early if a key is pressed. After the tune has been played, nothing happens until TunePlayedFlag is cleared.
The tunes played by this routine are:
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Play only if TunePlayedFlag is clear.
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| PlayMusicOnce | D69C | LD HL,$A747 | Point HL at the flag which says whether the tune has been played. | |||||||||
| D69F | LD A,(HL) | Fetch the flag. | ||||||||||
| D6A0 | AND A | Return if the tune has already been played. | ||||||||||
| D6A1 | RET NZ | |||||||||||
| D6A2 | SET 0,(HL) | Set the flag. | ||||||||||
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Stop if a key is pressed.
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| PlayMusicOnce_Loop | D6A4 | XOR A | Read every row of the keyboard. | |||||||||
| D6A5 | CALL ReadKeyboardPort | |||||||||||
| D6A8 | JR Z,PlayMusicOnce_Note | Jump to PlayMusicOnce_Note if no key is pressed. | ||||||||||
| D6AA | RET | Return. | ||||||||||
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Play the next note.
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| PlayMusicOnce_Note | D6AB | LD A,(DE) | Fetch the next note. | |||||||||
| D6AC | CP $FF | Jump to PlayMusic_Done if the terminator has been reached. | ||||||||||
| D6AE | JR Z,PlayMusic_Done | |||||||||||
| D6B0 | CALL PlayNote | Play the note. | ||||||||||
| D6B3 | JR PlayMusicOnce_Loop | Jump to PlayMusicOnce_Loop. | ||||||||||
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View the equivalent code in;
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