| Chase H.Q. | Routines |
| Prev: EE5E | Up: Map | Next: EE9E |
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Used by the routine at play_music_48k. Keep playing current pattern until this counter becomes zero.
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| next_pattern | EE6E | LD A,$00 | Load number of pattern repetitions. Self modified by EE7E, and below. | |
| EE70 | DEC A | Decrease | ||
| EE71 | LD ($EE6F),A | Self modify next_pattern above | ||
| EE74 | RET NZ | Return if non-zero | ||
| np_next | EE75 | LD HL,$0000 | Load address of current pattern. Self modified by EE83. | |
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This entry point is used by the routine at reset_music.
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| np_start_at_hl | EE78 | LD A,(HL) | Read new repetition count | |
| EE79 | INC HL | |||
| EE7A | CP $FF | Jump to np_restart if it's $FF (end of patterns) | ||
| EE7C | JR Z,np_restart | |||
| EE7E | LD ($EE6F),A | Self modify next_pattern above with new repetition count | ||
| EE81 | LD C,(HL) | Read music data offset | ||
| EE82 | INC HL | |||
| EE83 | LD ($EE76),HL | Self modify np_next above (pattern addr) | ||
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Calculate address of music data.
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| EE86 | LD B,$00 | BC = C | ||
| EE88 | LD HL,$F111 | Address of base of music data | ||
| EE8B | ADD HL,BC | Combine with offset | ||
| EE8C | LD A,(HL) | A = *HL++ -- load first byte of music data | ||
| EE8D | INC HL | |||
| EE8E | LD ($EEBA),A | Self modify pm_delay_complete (first byte of pattern) | ||
| EE91 | LD ($EEAE),A | Self modify pm_delay_1 (first byte of pattern) | ||
| EE94 | LD ($EECA),HL | Self modify pm_reset_pattern (addr of second music data byte in pattern) | ||
| EE97 | RET | Return | ||
| np_restart | EE98 | LD A,(HL) | HL = wordat(HL); HL++ | |
| EE99 | INC HL | |||
| EE9A | LD H,(HL) | |||
| EE9B | LD L,A | |||
| EE9C | JR np_start_at_hl | Jump to np_start_at_hl | ||
| Prev: EE5E | Up: Map | Next: EE9E |