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Routines |
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Used by the routine at GameMenu.
Plays a tune, but only if this routine has not played one before. Bit 0 of TunePlayedFlag is set the first time and nothing clears it. The tune stops when a key is pressed.
The tunes played by this routine are:
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Play only if TunePlayedFlag is clear.
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| PlayMusicOnce | 50749 | LD HL,48065 | Point HL at TunePlayedFlag. | |||||||||
| 50752 | LD A,(HL) | Return if TunePlayedFlag is set. | ||||||||||
| 50753 | AND A | |||||||||||
| 50754 | RET NZ | |||||||||||
| 50755 | SET 0,(HL) | Set bit 0 of TunePlayedFlag. | ||||||||||
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Stop if a key is pressed.
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| PlayMusicOnce_Loop | 50757 | XOR A | Select all of the keyboard rows. | |||||||||
| 50758 | CALL ReadKeyboardPort | Call ReadKeyboardPort. | ||||||||||
| 50761 | JR Z,PlayMusicOnce_Note | Jump to PlayMusicOnce_Note if no key is pressed. | ||||||||||
| 50763 | RET | Return. | ||||||||||
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Play the next note.
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| PlayMusicOnce_Note | 50764 | LD A,(DE) | Fetch the next note. | |||||||||
| 50765 | CP 255 | Jump to PlayMusic_Return if it is 255. | ||||||||||
| 50767 | JR Z,PlayMusic_Return | |||||||||||
| 50769 | CALL PlayNote | Call PlayNote. | ||||||||||
| 50772 | JR PlayMusicOnce_Loop | Jump to PlayMusicOnce_Loop. | ||||||||||
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View the equivalent code in;
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