ref: 94d755003ebd0abee80e276f2af964a453ec3ca1
dir: /audio/engine_3.asm/
; The third of three duplicated sound engines. Func_7d177: ; 7d177 (1f:5177) ld c, CH0 .loop ld b, $0 ld hl, $c026 add hl, bc ld a, [hl] and a jr z, .nextChannel ld a, c cp CH4 jr nc, .applyAffects ; if sfx channel ld a, [$c002] and a jr z, .applyAffects bit 7, a jr nz, .nextChannel set 7, a ld [$c002], a xor a ld [$FF00+$25], a ld [$FF00+$1a], a ld a, $80 ld [$FF00+$1a], a jr .nextChannel .applyAffects call Music1f_Music2_ApplyMusicAffects .nextChannel ld a, c inc c ; inc channel number cp CH7 jr nz, .loop ret ; this routine checks flags for music effects currently applied ; to the channel and calls certain functions based on flags. ; known flags for $c02e: ; 1: call has been used ; 3: a toggle used only by this routine for vibrato ; 4: pitchbend flag ; 6: dutycycle flag Music1f_Music2_ApplyMusicAffects: ; 7d1ac (1f:51ac) ld b, $0 ld hl, $c0b6 ; delay until next note add hl, bc ld a, [hl] cp $1 ; if delay is 1, play next note jp z, Music1f_Music2_PlayNextNote dec a ; otherwise, decrease the delay timer ld [hl], a ld a, c cp CH4 jr nc, .startChecks ; if a sfx channel ld hl, $c02a add hl, bc ld a, [hl] and a jr z, .startChecks ret .startChecks ld hl, $c02e add hl, bc bit 6, [hl] ; dutycycle jr z, .checkForExecuteMusic call Music1f_ApplyDutyCycle .checkForExecuteMusic ld b, $0 ld hl, $c036 add hl, bc bit 0, [hl] jr nz, .checkForPitchBend ld hl, $c02e add hl, bc bit 2, [hl] jr nz, .disablePitchBendVibrato .checkForPitchBend ld hl, $c02e add hl, bc bit 4, [hl] ; pitchbend jr z, .checkVibratoDelay jp Music1f_ApplyPitchBend .checkVibratoDelay ld hl, $c04e ; vibrato delay add hl, bc ld a, [hl] and a ; check if delay is over jr z, .checkForVibrato dec [hl] ; otherwise, dec delay .disablePitchBendVibrato ret .checkForVibrato ld hl, $c056 ; vibrato rate add hl, bc ld a, [hl] and a jr nz, .vibrato ret ; no vibrato .vibrato ld d, a ld hl, $c05e add hl, bc ld a, [hl] and $f and a jr z, .vibratoAlreadyDone dec [hl] ; apply vibrato pitch change ret .vibratoAlreadyDone ld a, [hl] swap [hl] or [hl] ld [hl], a ; reset the vibrato value and start again ld hl, $c066 add hl, bc ld e, [hl] ; get note pitch ld hl, $c02e add hl, bc bit 3, [hl] ; this is the only code that sets/resets bit three so jr z, .unset ; it continuously alternates which path it takes res 3, [hl] ld a, d and $f ld d, a ld a, e sub d jr nc, .noCarry ld a, $0 .noCarry jr .done .unset set 3, [hl] ld a, d and $f0 swap a add e jr nc, .done ld a, $ff .done ld d, a ld b, $3 call Func_7d8ac ld [hl], d ret ; this routine executes all music commands that take up no time, ; like tempo changes, duty changes etc. and doesn't return ; until the first note is reached Music1f_Music2_PlayNextNote: ; 7d244 (1f:5244) ld hl, $c06e add hl, bc ld a, [hl] ld hl, $c04e add hl, bc ld [hl], a ld hl, $c02e add hl, bc res 4, [hl] res 5, [hl] call Music1f_endchannel ret Music1f_endchannel: ; 7d25a (1f:525a) call Music1f_GetNextMusicByte ld d, a cp $ff ; is this command an endchannel? jp nz, Music1f_callchannel ; no ld b, $0 ; yes ld hl, $c02e add hl, bc bit 1, [hl] jr nz, .returnFromCall ld a, c cp CH3 jr nc, .noiseOrSfxChannel jr .asm_7d2b3 .noiseOrSfxChannel res 2, [hl] ld hl, $c036 add hl, bc res 0, [hl] cp CH6 jr nz, .notSfxChannel3 ld a, $0 ld [$FF00+$1a], a ld a, $80 ld [$FF00+$1a], a .notSfxChannel3 jr nz, .asm_7d296 ld a, [$c003] and a jr z, .asm_7d296 xor a ld [$c003], a jr .asm_7d2b3 .asm_7d296 jr .asm_7d2bc .returnFromCall res 1, [hl] ld d, $0 ld a, c add a ld e, a ld hl, $c006 add hl, de push hl ; store current channel address ld hl, $c016 add hl, de ld e, l ld d, h pop hl ld a, [de] ld [hli], a inc de ld a, [de] ld [hl], a ; loads channel address to return to jp Music1f_endchannel .asm_7d2b3 ld hl, Unknown_7db93 add hl, bc ld a, [$FF00+$25] and [hl] ld [$FF00+$25], a .asm_7d2bc ld a, [$c02a] cp $14 jr nc, .asm_7d2c5 jr .asm_7d2e2 .asm_7d2c5 ld a, [$c02a] cp $86 jr z, .asm_7d2e2 jr c, .asm_7d2d0 jr .asm_7d2e2 .asm_7d2d0 ld a, c cp CH4 jr z, .asm_7d2d9 call Func_7d73b ret c .asm_7d2d9 ld a, [$c005] ld [$FF00+$24], a xor a ld [$c005], a .asm_7d2e2 ld hl, $c026 add hl, bc ld [hl], b ret Music1f_callchannel: ; 7d2e8 (1f:52e8) cp $fd ; is this command a callchannel? jp nz, Music1f_loopchannel ; no call Music1f_GetNextMusicByte ; yes push af call Music1f_GetNextMusicByte ld d, a pop af ld e, a push de ; store pointer ld d, $0 ld a, c add a ld e, a ld hl, $c006 add hl, de push hl ld hl, $c016 add hl, de ld e, l ld d, h pop hl ld a, [hli] ld [de], a inc de ld a, [hld] ld [de], a ; copy current channel address pop de ld [hl], e inc hl ld [hl], d ; overwrite current address with pointer ld b, $0 ld hl, $c02e add hl, bc set 1, [hl] ; set the call flag jp Music1f_endchannel Music1f_loopchannel: ; 7d31d (1f:531d) cp $fe ; is this command a loopchannel? jp nz, Music1f_notetype ; no call Music1f_GetNextMusicByte ; yes ld e, a and a jr z, .infiniteLoop ld b, $0 ld hl, $c0be add hl, bc ld a, [hl] cp e jr nz, .loopAgain ld a, $1 ; if no more loops to make ld [hl], a call Music1f_GetNextMusicByte ; skip pointer call Music1f_GetNextMusicByte jp Music1f_endchannel .loopAgain ; inc loop count inc a ld [hl], a ; fall through .infiniteLoop ; overwrite current address with pointer call Music1f_GetNextMusicByte push af call Music1f_GetNextMusicByte ld b, a ld d, $0 ld a, c add a ld e, a ld hl, $c006 add hl, de pop af ld [hli], a ld [hl], b jp Music1f_endchannel Music1f_notetype: ; 7d358 (1f:5358) and $f0 cp $d0 ; is this command a notetype? jp nz, Music1f_togglecall ; no ld a, d ; yes and $f ld b, $0 ld hl, $c0c6 add hl, bc ld [hl], a ; store low nibble as speed ld a, c cp CH3 jr z, .noiseChannel ; noise channel has 0 params call Music1f_GetNextMusicByte ld d, a ld a, c cp CH2 jr z, .musicChannel3 cp CH6 jr nz, .notChannel3 ld hl, $c0e7 jr .sfxChannel3 .musicChannel3 ld hl, $c0e6 .sfxChannel3 ld a, d and $f ld [hl], a ; store low nibble of param as duty ld a, d and $30 sla a ld d, a ; fall through ; if channel 3, store high nibble as volume ; else, store volume (high nibble) and fade (low nibble) .notChannel3 ld b, $0 ld hl, $c0de add hl, bc ld [hl], d .noiseChannel jp Music1f_endchannel Music1f_togglecall: ; 7d397 (1f:5397) ld a, d cp $e8 ; is this command an togglecall? jr nz, Music1f_vibrato ; no ld b, $0 ; yes ld hl, $c02e add hl, bc ld a, [hl] xor $1 ld [hl], a ; flip bit 0 of $c02e (toggle returning from call) jp Music1f_endchannel Music1f_vibrato: ; 7d3a9 (1f:53a9) cp $ea ; is this command a vibrato? jr nz, Music1f_pitchbend ; no call Music1f_GetNextMusicByte ; yes ld b, $0 ld hl, $c04e add hl, bc ld [hl], a ; store delay ld hl, $c06e add hl, bc ld [hl], a ; store delay call Music1f_GetNextMusicByte ld d, a and $f0 swap a ld b, $0 ld hl, $c056 add hl, bc srl a ld e, a adc b swap a or e ld [hl], a ; store rate as both high and low nibbles ld a, d and $f ld d, a ld hl, $c05e add hl, bc swap a or d ld [hl], a ; store depth as both high and low nibbles jp Music1f_endchannel Music1f_pitchbend: ; 7d3e1 (1f:53e1) cp $eb ; is this command a pitchbend? jr nz, Music1f_duty ; no call Music1f_GetNextMusicByte ; yes ld b, $0 ld hl, $c076 add hl, bc ld [hl], a ; store first param call Music1f_GetNextMusicByte ld d, a and $f0 swap a ld b, a ld a, d and $f call Func_7d8cc ld b, $0 ld hl, $c0a6 add hl, bc ld [hl], d ; store unknown part of second param ld hl, $c0ae add hl, bc ld [hl], e ; store unknown part of second param ld b, $0 ld hl, $c02e add hl, bc set 4, [hl] ; set pitchbend flag call Music1f_GetNextMusicByte ld d, a jp Music1f_notelength Music1f_duty: ; 7d419 (1f:5419) cp $ec ; is this command a duty? jr nz, Music1f_tempo ; no call Music1f_GetNextMusicByte ; yes rrca rrca and $c0 ld b, $0 ld hl, $c03e add hl, bc ld [hl], a ; store duty jp Music1f_endchannel Music1f_tempo: ; 7d42e (1f:542e) cp $ed ; is this command a tempo? jr nz, Music1f_unknownmusic0xee ; no ld a, c ; yes cp CH4 jr nc, .sfxChannel call Music1f_GetNextMusicByte ld [$c0e8], a ; store first param call Music1f_GetNextMusicByte ld [$c0e9], a ; store second param xor a ld [$c0ce], a ; clear RAM ld [$c0cf], a ld [$c0d0], a ld [$c0d1], a jr .musicChannelDone .sfxChannel call Music1f_GetNextMusicByte ld [$c0ea], a ; store first param call Music1f_GetNextMusicByte ld [$c0eb], a ; store second param xor a ld [$c0d2], a ; clear RAM ld [$c0d3], a ld [$c0d4], a ld [$c0d5], a .musicChannelDone jp Music1f_endchannel Music1f_unknownmusic0xee: ; 7d46e (1f:546e) cp $ee ; is this command an unknownmusic0xee? jr nz, Music1f_unknownmusic0xef ; no call Music1f_GetNextMusicByte ; yes ld [$c004], a ; store first param jp Music1f_endchannel ; this appears to never be used Music1f_unknownmusic0xef: ; 7d47b (1f:547b) cp $ef ; is this command an unknownmusic0xef? jr nz, Music1f_dutycycle ; no call Music1f_GetNextMusicByte ; yes push bc call Func_7d8ea pop bc ld a, [$c003] and a jr nz, .skip ld a, [$c02d] ld [$c003], a xor a ld [$c02d], a .skip jp Music1f_endchannel Music1f_dutycycle: ; 7d49a (1f:549a) cp $fc ; is this command a dutycycle? jr nz, Music1f_stereopanning ; no call Music1f_GetNextMusicByte ; yes ld b, $0 ld hl, $c046 add hl, bc ld [hl], a ; store full cycle and $c0 ld hl, $c03e add hl, bc ld [hl], a ; store first duty ld hl, $c02e add hl, bc set 6, [hl] ; set duty flag jp Music1f_endchannel Music1f_stereopanning: ; 7d4b8 (1f:54b8) cp $f0 ; is this command a stereopanning? jr nz, Music1f_executemusic ; no call Music1f_GetNextMusicByte ; yes ld [$FF00+$24], a ; store stereopanning jp Music1f_endchannel Music1f_executemusic: ; 7d4c4 (1f:54c4) cp $f8 ; is this command an executemusic? jr nz, Music1f_octave ; no ld b, $0 ; yes ld hl, $c036 add hl, bc set 0, [hl] jp Music1f_endchannel Music1f_octave: ; 7d4d3 (1f:54d3) and $f0 cp $e0 ; is this command an octave? jr nz, Music1f_unknownsfx0x20 ; no ld hl, $c0d6 ; yes ld b, $0 add hl, bc ld a, d and $f ld [hl], a ; store low nibble as octave jp Music1f_endchannel Music1f_unknownsfx0x20: ; 7d4e6 (1f:54e6) cp $20 ; is this command an unknownsfx0x20? jr nz, Music1f_unknownsfx0x10 ; no ld a, c cp CH3 ; is this a noise or sfx channel? jr c, Music1f_unknownsfx0x10 ; no ld b, $0 ld hl, $c036 add hl, bc bit 0, [hl] jr nz, Music1f_unknownsfx0x10 ; no call Music1f_notelength ; yes ld d, a ld b, $0 ld hl, $c03e add hl, bc ld a, [hl] or d ld d, a ld b, $1 call Func_7d8ac ld [hl], d call Music1f_GetNextMusicByte ld d, a ld b, $2 call Func_7d8ac ld [hl], d call Music1f_GetNextMusicByte ld e, a ld a, c cp CH7 ld a, $0 jr z, .sfxNoiseChannel ; only two params for noise channel push de call Music1f_GetNextMusicByte pop de .sfxNoiseChannel ld d, a push de call Func_7d69d call Func_7d66c pop de call Func_7d6bf ret Music1f_unknownsfx0x10 ; 7d533 (1f:5533) ld a, c cp CH4 jr c, Music1f_note ; if not a sfx ld a, d cp $10 ; is this command an unknownsfx0x10? jr nz, Music1f_note ; no ld b, $0 ld hl, $c036 add hl, bc bit 0, [hl] jr nz, Music1f_note ; no call Music1f_GetNextMusicByte ; yes ld [$FF00+$10], a jp Music1f_endchannel Music1f_note: ; 7d54f (1f:554f) ld a, c cp CH3 jr nz, Music1f_notelength ; if not noise channel ld a, d and $f0 cp $b0 ; is this command a dnote? jr z, Music1f_dnote ; yes jr nc, Music1f_notelength ; no swap a ld b, a ld a, d and $f ld d, a ld a, b push de push bc jr asm_7d571 Music1f_dnote: ; 7d569 (1f:5569) ld a, d and $f push af push bc call Music1f_GetNextMusicByte ; get dnote instrument asm_7d571 ld d, a ld a, [$c003] and a jr nz, .asm_7d57c ld a, d call Func_7d8ea .asm_7d57c pop bc pop de Music1f_notelength: ; 7d57e (1f:557e) ld a, d push af and $f inc a ld b, $0 ld e, a ; store note length (in 16ths) ld d, b ld hl, $c0c6 add hl, bc ld a, [hl] ld l, b call Func_7d8bb ld a, c cp CH4 jr nc, .sfxChannel ld a, [$c0e8] ld d, a ld a, [$c0e9] ld e, a jr .skip .sfxChannel ld d, $1 ld e, $0 cp CH7 jr z, .skip ; if noise channel call Func_7d707 ld a, [$c0ea] ld d, a ld a, [$c0eb] ld e, a .skip ld a, l ld b, $0 ld hl, $c0ce add hl, bc ld l, [hl] call Func_7d8bb ld e, l ld d, h ld hl, $c0ce add hl, bc ld [hl], e ld a, d ld hl, $c0b6 add hl, bc ld [hl], a ld hl, $c036 add hl, bc bit 0, [hl] jr nz, Music1f_notepitch ld hl, $c02e add hl, bc bit 2, [hl] jr z, Music1f_notepitch pop hl ret Music1f_notepitch: ; 7d5dc (1f:55dc) pop af and $f0 cp $c0 ; compare to rest jr nz, .notRest ld a, c cp CH4 jr nc, .sfxChannel ld hl, $c02a add hl, bc ld a, [hl] and a jr nz, .quit ; fall through .sfxChannel ld a, c cp CH2 jr z, .musicChannel3 cp CH6 jr nz, .notSfxChannel3 .musicChannel3 ld b, $0 ld hl, Unknown_7db93 add hl, bc ld a, [$FF00+$25] and [hl] ld [$FF00+$25], a jr .quit .notSfxChannel3 ld b, $2 call Func_7d8ac ld a, $8 ld [hli], a inc hl ld a, $80 ld [hl], a .quit ret .notRest swap a ld b, $0 ld hl, $c0d6 add hl, bc ld b, [hl] call Func_7d8cc ld b, $0 ld hl, $c02e add hl, bc bit 4, [hl] jr z, .asm_7d62c call Func_7d803 .asm_7d62c push de ld a, c cp CH4 jr nc, .skip ; if sfx Channel ld hl, $c02a ld d, $0 ld e, a add hl, de ld a, [hl] and a jr nz, .done jr .skip .done pop de ret .skip ld b, $0 ld hl, $c0de add hl, bc ld d, [hl] ld b, $2 call Func_7d8ac ld [hl], d call Func_7d69d call Func_7d66c pop de ld b, $0 ld hl, $c02e add hl, bc bit 0, [hl] jr z, .asm_7d663 inc e jr nc, .asm_7d663 inc d .asm_7d663 ld hl, $c066 add hl, bc ld [hl], e call Func_7d6bf ret Func_7d66c: ; 7d66c (1f:566c) ld b, $0 ld hl, Unknown_7db9b add hl, bc ld a, [$FF00+$25] or [hl] ld d, a ld a, c cp CH7 jr z, .sfxNoiseChannel cp CH4 jr nc, .skip ; if sfx channel ld hl, $c02a add hl, bc ld a, [hl] and a jr nz, .skip .sfxNoiseChannel ld a, [$c004] ld hl, Unknown_7db9b add hl, bc and [hl] ld d, a ld a, [$FF00+$25] ld hl, Unknown_7db93 add hl, bc and [hl] or d ld d, a .skip ld a, d ld [$FF00+$25], a ret Func_7d69d: ; 7d69d (1f:569d) ld b, $0 ld hl, $c0b6 add hl, bc ld d, [hl] ld a, c cp CH2 jr z, .channel3 ; if music channel 3 cp CH6 jr z, .channel3 ; if sfx channel 3 ld a, d and $3f ld d, a ld hl, $c03e add hl, bc ld a, [hl] or d ld d, a .channel3 ld b, $1 call Func_7d8ac ld [hl], d ret Func_7d6bf: ; 7d6bf (1f:56bf) ld a, c cp CH2 jr z, .channel3 cp CH6 jr nz, .notSfxChannel3 ; fall through .channel3 push de ld de, $c0e6 cp CH2 jr z, .musicChannel3 ld de, $c0e7 .musicChannel3 ld a, [de] add a ld d, $0 ld e, a ld hl, Music1f_Channel3DutyPointers add hl, de ld e, [hl] inc hl ld d, [hl] ld hl, $ff30 ld b, $f ld a, $0 ld [$FF00+$1a], a .loop ld a, [de] inc de ld [hli], a ld a, b dec b and a jr nz, .loop ld a, $80 ld [$FF00+$1a], a pop de .notSfxChannel3 ld a, d or $80 and $c7 ld d, a ld b, $3 call Func_7d8ac ld [hl], e inc hl ld [hl], d call Func_7d729 ret Func_7d707: ; 7d707 (1f:5707) call Func_7d759 jr nc, .asm_7d71f ld d, $0 ld a, [$c0f2] add $80 jr nc, .asm_7d716 inc d .asm_7d716 ld [$c0eb], a ld a, d ld [$c0ea], a jr .asm_7d728 .asm_7d71f xor a ld [$c0eb], a ld a, $1 ld [$c0ea], a .asm_7d728 ret Func_7d729: ; 7d729 (1f:5729) call Func_7d759 jr nc, .asm_7d73a ld a, [$c0f1] add e jr nc, .asm_7d735 inc d .asm_7d735 dec hl ld e, a ld [hl], e inc hl ld [hl], d .asm_7d73a ret Func_7d73b: ; 7d73b (1f:573b) call Func_7d759 jr nc, .asm_7d756 ld hl, $c006 ld e, c ld d, $0 sla e rl d add hl, de ld a, [hl] sub $1 ld [hl], a inc hl ld a, [hl] sbc $0 ld [hl], a scf ret .asm_7d756 scf ccf ret Func_7d759: ; 7d759 (1f:5759) ld a, [$c02a] cp $14 jr nc, .asm_7d762 jr .asm_7d768 .asm_7d762 cp $86 jr z, .asm_7d768 jr c, .asm_7d76b .asm_7d768 scf ccf ret .asm_7d76b scf ret Music1f_ApplyPitchBend: ; 7d76d (1f:576d) ld hl, $c02e add hl, bc bit 5, [hl] jp nz, .asm_7d7b4 ld hl, $c09e add hl, bc ld e, [hl] ld hl, $c096 add hl, bc ld d, [hl] ld hl, $c07e add hl, bc ld l, [hl] ld h, b add hl, de ld d, h ld e, l ld hl, $c08e add hl, bc push hl ld hl, $c086 add hl, bc ld a, [hl] pop hl add [hl] ld [hl], a ld a, $0 adc e ld e, a ld a, $0 adc d ld d, a ld hl, $c0a6 add hl, bc ld a, [hl] cp d jp c, .asm_7d7fa jr nz, .asm_7d7e7 ld hl, $c0ae add hl, bc ld a, [hl] cp e jp c, .asm_7d7fa jr .asm_7d7e7 .asm_7d7b4 ld hl, $c09e add hl, bc ld a, [hl] ld hl, $c096 add hl, bc ld d, [hl] ld hl, $c07e add hl, bc ld e, [hl] sub e ld e, a ld a, d sbc b ld d, a ld hl, $c086 add hl, bc ld a, [hl] add a ld [hl], a ld a, e sbc b ld e, a ld a, d sbc b ld d, a ld hl, $c0a6 add hl, bc ld a, d cp [hl] jr c, .asm_7d7fa jr nz, .asm_7d7e7 ld hl, $c0ae add hl, bc ld a, e cp [hl] jr c, .asm_7d7fa .asm_7d7e7 ld hl, $c09e add hl, bc ld [hl], e ld hl, $c096 add hl, bc ld [hl], d ld b, $3 call Func_7d8ac ld a, e ld [hli], a ld [hl], d ret .asm_7d7fa ld hl, $c02e add hl, bc res 4, [hl] res 5, [hl] ret Func_7d803: ; 7d803 (1f:5803) ld hl, $c096 add hl, bc ld [hl], d ld hl, $c09e add hl, bc ld [hl], e ld hl, $c0b6 add hl, bc ld a, [hl] ld hl, $c076 add hl, bc sub [hl] jr nc, .asm_7d81b ld a, $1 .asm_7d81b ld [hl], a ld hl, $c0ae add hl, bc ld a, e sub [hl] ld e, a ld a, d sbc b ld hl, $c0a6 add hl, bc sub [hl] jr c, .asm_7d837 ld d, a ld b, $0 ld hl, $c02e add hl, bc set 5, [hl] jr .asm_7d85a .asm_7d837 ld hl, $c096 add hl, bc ld d, [hl] ld hl, $c09e add hl, bc ld e, [hl] ld hl, $c0ae add hl, bc ld a, [hl] sub e ld e, a ld a, d sbc b ld d, a ld hl, $c0a6 add hl, bc ld a, [hl] sub d ld d, a ld b, $0 ld hl, $c02e add hl, bc res 5, [hl] .asm_7d85a ld hl, $c076 add hl, bc .asm_7d85e inc b ld a, e sub [hl] ld e, a jr nc, .asm_7d85e ld a, d and a jr z, .asm_7d86c dec a ld d, a jr .asm_7d85e .asm_7d86c ld a, e add [hl] ld d, b ld b, $0 ld hl, $c07e add hl, bc ld [hl], d ld hl, $c086 add hl, bc ld [hl], a ld hl, $c08e add hl, bc ld [hl], a ret Music1f_ApplyDutyCycle: ; 7d881 (1f:5881) ld b, $0 ld hl, $c046 add hl, bc ld a, [hl] rlca rlca ld [hl], a and $c0 ld d, a ld b, $1 call Func_7d8ac ld a, [hl] and $3f or d ld [hl], a ret Music1f_GetNextMusicByte: ; 7d899 (1f:5899) ld d, $0 ld a, c add a ld e, a ld hl, $c006 add hl, de ld a, [hli] ld e, a ld a, [hld] ld d, a ld a, [de] ; get next music command inc de ld [hl], e ; store address of next command inc hl ld [hl], d ret Func_7d8ac: ; 7d8ac (1f:58ac) ld a, c ld hl, Unknown_7db8b add l jr nc, .noCarry inc h .noCarry ld l, a ld a, [hl] add b ld l, a ld h, $ff ret Func_7d8bb: ; 7d8bb (1f:58bb) ld h, $0 .loop srl a jr nc, .noCarry add hl, de .noCarry sla e rl d and a jr z, .done jr .loop .done ret Func_7d8cc: ; 7d8cc (1f:58cc) ld h, $0 ld l, a add hl, hl ld d, h ld e, l ld hl, Unknown_7dba3 add hl, de ld e, [hl] inc hl ld d, [hl] ld a, b .loop cp $7 jr z, .done sra d rr e inc a jr .loop .done ld a, $8 add d ld d, a ret Func_7d8ea: ; 7d8ea (1f:58ea) ld [$c001], a cp $ff jp z, Func_7daa8 cp $c2 jp z, Func_7d9c2 jp c, Func_7d9c2 cp $fe jr z, .asm_7d901 jp nc, Func_7d9c2 .asm_7d901 xor a ld [$c000], a ld [$c003], a ld [$c0e9], a ld [$c0e6], a ld [$c0e7], a ld d, $8 ld hl, $c016 call FillMusicRAM1f ld hl, $c006 call FillMusicRAM1f ld d, $4 ld hl, $c026 call FillMusicRAM1f ld hl, $c02e call FillMusicRAM1f ld hl, $c03e call FillMusicRAM1f ld hl, $c046 call FillMusicRAM1f ld hl, $c04e call FillMusicRAM1f ld hl, $c056 call FillMusicRAM1f ld hl, $c05e call FillMusicRAM1f ld hl, $c066 call FillMusicRAM1f ld hl, $c06e call FillMusicRAM1f ld hl, $c036 call FillMusicRAM1f ld hl, $c076 call FillMusicRAM1f ld hl, $c07e call FillMusicRAM1f ld hl, $c086 call FillMusicRAM1f ld hl, $c08e call FillMusicRAM1f ld hl, $c096 call FillMusicRAM1f ld hl, $c09e call FillMusicRAM1f ld hl, $c0a6 call FillMusicRAM1f ld hl, $c0ae call FillMusicRAM1f ld a, $1 ld hl, $c0be call FillMusicRAM1f ld hl, $c0b6 call FillMusicRAM1f ld hl, $c0c6 call FillMusicRAM1f ld [$c0e8], a ld a, $ff ld [$c004], a xor a ld [$FF00+$24], a ld a, $8 ld [$FF00+$10], a ld a, $0 ld [$FF00+$25], a xor a ld [$FF00+$1a], a ld a, $80 ld [$FF00+$1a], a ld a, $77 ld [$FF00+$24], a jp Func_7db03 Func_7d9c2: ; 7d9c2 (1f:59c2) ld l, a ld e, a ld h, $0 ld d, h add hl, hl add hl, de ld de, SFX_Headers_1f add hl, de ld a, h ld [$c0ec], a ld a, l ld [$c0ed], a ld a, [hl] and $c0 rlca rlca ld c, a .asm_7d9db ld d, c ld a, c add a add c ld c, a ld b, $0 ld a, [$c0ec] ld h, a ld a, [$c0ed] ld l, a add hl, bc ld c, d ld a, [hl] and $f ld e, a ld d, $0 ld hl, $c026 add hl, de ld a, [hl] and a jr z, .asm_7da17 ld a, e cp $7 jr nz, .asm_7da0e ld a, [$c001] cp $14 jr nc, .asm_7da07 ret .asm_7da07 ld a, [hl] cp $14 jr z, .asm_7da17 jr c, .asm_7da17 .asm_7da0e ld a, [$c001] cp [hl] jr z, .asm_7da17 jr c, .asm_7da17 ret .asm_7da17 xor a push de ld h, d ld l, e add hl, hl ld d, h ld e, l ld hl, $c016 add hl, de ld [hli], a ld [hl], a ld hl, $c006 add hl, de ld [hli], a ld [hl], a pop de ld hl, $c026 add hl, de ld [hl], a ld hl, $c02e add hl, de ld [hl], a ld hl, $c03e add hl, de ld [hl], a ld hl, $c046 add hl, de ld [hl], a ld hl, $c04e add hl, de ld [hl], a ld hl, $c056 add hl, de ld [hl], a ld hl, $c05e add hl, de ld [hl], a ld hl, $c066 add hl, de ld [hl], a ld hl, $c06e add hl, de ld [hl], a ld hl, $c076 add hl, de ld [hl], a ld hl, $c07e add hl, de ld [hl], a ld hl, $c086 add hl, de ld [hl], a ld hl, $c08e add hl, de ld [hl], a ld hl, $c096 add hl, de ld [hl], a ld hl, $c09e add hl, de ld [hl], a ld hl, $c0a6 add hl, de ld [hl], a ld hl, $c0ae add hl, de ld [hl], a ld hl, $c036 add hl, de ld [hl], a ld a, $1 ld hl, $c0be add hl, de ld [hl], a ld hl, $c0b6 add hl, de ld [hl], a ld hl, $c0c6 add hl, de ld [hl], a ld a, e cp $4 jr nz, .asm_7da9f ld a, $8 ld [$FF00+$10], a .asm_7da9f ld a, c and a jp z, Func_7db03 dec c jp .asm_7d9db Func_7daa8: ; 7daa8 (1f:5aa8) ld a, $80 ld [$FF00+$26], a ld [$FF00+$1a], a xor a ld [$FF00+$25], a ld [$FF00+$1c], a ld a, $8 ld [$FF00+$10], a ld [$FF00+$12], a ld [$FF00+$17], a ld [$FF00+$21], a ld a, $40 ld [$FF00+$14], a ld [$FF00+$19], a ld [$FF00+$23], a ld a, $77 ld [$FF00+$24], a xor a ld [$c000], a ld [$c003], a ld [$c002], a ld [$c0e9], a ld [$c0eb], a ld [$c0e6], a ld [$c0e7], a ld d, $a0 ld hl, $c006 call FillMusicRAM1f ld a, $1 ld d, $18 ld hl, $c0b6 call FillMusicRAM1f ld [$c0e8], a ld [$c0ea], a ld a, $ff ld [$c004], a ret ; fills d bytes at hl with a FillMusicRAM1f: ; 7dafd (1f:5afd) ld b, d .loop ld [hli], a dec b jr nz, .loop ret Func_7db03: ; 7db03 (1f:5b03) ld a, [$c001] ld l, a ld e, a ld h, $0 ld d, h add hl, hl add hl, de ld de, SFX_Headers_1f add hl, de ld e, l ld d, h ld hl, $c006 ld a, [de] ; get channel number ld b, a rlca rlca and $3 ld c, a ld a, b and $f ld b, c inc b inc de ld c, $0 .asm_7db25 cp c jr z, .asm_7db2d inc c inc hl inc hl jr .asm_7db25 .asm_7db2d push hl push bc push af ld b, $0 ld c, a ld hl, $c026 add hl, bc ld a, [$c001] ld [hl], a pop af cp $3 jr c, .asm_7db46 ld hl, $c02e add hl, bc set 2, [hl] .asm_7db46 pop bc pop hl ld a, [de] ; get channel pointer ld [hli], a inc de ld a, [de] ld [hli], a inc de inc c dec b ld a, b and a ld a, [de] inc de jr nz, .asm_7db25 ld a, [$c001] cp $14 jr nc, .asm_7db5f jr .asm_7db89 .asm_7db5f ld a, [$c001] cp $86 jr z, .asm_7db89 jr c, .asm_7db6a jr .asm_7db89 .asm_7db6a ld hl, $c02a ld [hli], a ld [hli], a ld [hli], a ld [hl], a ld hl, $c012 ; sfx noise channel pointer ld de, Noise1f_endchannel ld [hl], e inc hl ld [hl], d ; overwrite pointer to point to endchannel ld a, [$c005] and a jr nz, .asm_7db89 ld a, [$FF00+$24] ld [$c005], a ld a, $77 ld [$FF00+$24], a .asm_7db89 ret Noise1f_endchannel: ; 7db8a (1f:5b8a) endchannel Unknown_7db8b: ; 7db8b (1f:5b8b) db $10, $15, $1A, $1F ; channels 0-3 db $10, $15, $1A, $1F ; channels 4-7 Unknown_7db93: ; 7db93 (1f:5b93) db $EE, $DD, $BB, $77 ; channels 0-3 db $EE, $DD, $BB, $77 ; channels 4-7 Unknown_7db9b: ; 7db9b (1f:5b9b) db $11, $22, $44, $88 ; channels 0-3 db $11, $22, $44, $88 ; channels 4-7 Unknown_7dba3: ; 7dba3 (1f:5ba3) dw $F82C dw $F89D dw $F907 dw $F96B dw $F9CA dw $FA23 dw $FA77 dw $FAC7 dw $FB12 dw $FB58 dw $FB9B dw $FBDA