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Routines |
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Used by the routines at RunHandlers and Sounds_Telecast.
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| PlaySounds | FF00 | LD A,($FF8D) | Return if no sound(s) are set to play (via *MelodyID). | |
| FF03 | AND A | |||
| FF04 | RET Z | |||
| FF05 | LD L,A | Store the melody ID in L temporarily. | ||
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Reset the *MelodyID (so it doesn't carry on playing).
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| FF06 | XOR A | Write 00 to *MelodyID. | ||
| FF07 | LD ($FF8D),A | |||
| FF0A | LD A,L | Restore the melody ID back to A. | ||
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Handle special cases for the in-game buildings crumbling and then collapsing.
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| FF0B | CP $08 | Jump to InitSound_BuildingCollapsing if the melody is for the building collapsing (08). | ||
| FF0D | JR Z,InitSound_BuildingCollapsing | |||
| FF0F | CP $09 | Jump to InitSound_BuildingCrumbling if the melody is for the building crumbling (09). | ||
| FF11 | JR Z,InitSound_BuildingCrumbling | |||
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Fetch the melody data using the melody ID as an offset.
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| FF13 | DEC A | Decrease the melody ID by one for the table lookup. | ||
| FF14 | ADD A,A | Multiple the melody ID by 08 as the table holds eight bytes of data for the melodies. | ||
| FF15 | ADD A,A | |||
| FF16 | ADD A,A | |||
| FF17 | LD H,$00 | Create an offset using HL. | ||
| FF19 | LD L,A | |||
| FF1A | LD DE,$FF8E | HL+=Table_Melodies. | ||
| FF1D | ADD HL,DE | |||
| FF1E | LD DE,$FF85 | DE=MelodyBuffer. | ||
| FF21 | LD BC,$0008 | BC=0008. | ||
| FF24 | LDIR | Copy the selected melody data into MelodyBuffer. | ||
| FF26 | LD A,($FF8C) | Jump to PlaySounds_Loop if *FF8C is equal to 02. | ||
| FF29 | CP $02 | |||
| FF2B | JR Z,PlaySounds_Loop | |||
| PlaySounds_Loop | FF2D | LD A,($FF8B) | Jump to Sounds_SpeakerOff if *FF8B is zero. | |
| FF30 | AND A | |||
| FF31 | JR Z,Sounds_SpeakerOff | |||
| FF33 | DEC A | Decrease A by one. | ||
| FF34 | LD ($FF8B),A | Write A to *FF8B. | ||
| FF37 | CALL PlayBeeper | Call PlayBeeper. | ||
| FF3A | ADD HL,BC | HL+=BC. | ||
| FF3B | LD ($FF85),HL | Write HL to *MelodyBuffer. | ||
| FF3E | JR PlaySounds_Loop | Jump to PlaySounds_Loop. | ||
| Unused_PlaySound_Loop | FF40 | LD A,($FF8B) | Jump to Sounds_SpeakerOff if *FF8B is zero. | |
| FF43 | AND A | |||
| FF44 | JR Z,Sounds_SpeakerOff | |||
| FF46 | DEC A | Decrease A by one. | ||
| FF47 | LD ($FF8B),A | Write A to *FF8B. | ||
| FF4A | CALL PlayBeeper | Call PlayBeeper. | ||
| FF4D | OR A | Set the bits from A. | ||
| FF4E | SBC HL,BC | HL-=BC. | ||
| FF50 | LD ($FF85),HL | Write HL to *MelodyBuffer. | ||
| FF53 | JR Unused_PlaySound_Loop | Jump to Unused_PlaySound_Loop. | ||
| PlayBeeper | FF55 | LD HL,($FF85) | HL=Loop delay parameter (*FF85). | |
| FF58 | LD DE,($FF87) | DE=Number of passes to make through the sound generation loop (*FF87). | ||
| FF5C | CALL $03B5 | Call BEEPER. | ||
| FF5F | LD HL,($FF85) | HL=*MelodyBuffer. | ||
| FF62 | LD BC,($FF89) | BC=*FF89. | ||
| FF66 | RET | Return. | ||
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Flip speaker off (unset bit 4).
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| Sounds_SpeakerOff | FF67 | XOR A | Speaker off. | |
| FF68 | OUT ($FE),A | |||
| FF6A | RET | Return. | ||
| InitSound_BuildingCollapsing | FF6B | LD HL,$007D | HL=007D. | |
| FF6E | LD C,$64 | C=64. | ||
| FF70 | JR PlaySounds_Building_Loop | Jump to PlaySounds_Building_Loop. | ||
| InitSound_BuildingCrumbling | FF72 | LD HL,$00FA | HL=00FA. | |
| FF75 | LD C,$19 | C=19. | ||
| PlaySounds_Building_Loop | FF77 | LD A,(HL) | A=*HL. | |
| FF78 | AND %11111000 | Keep only bits 3-7. | ||
| FF7A | OUT ($FE),A | OUT FE | ||
| FF7C | LD B,C | B=C. | ||
| PlaySounds_Building_Delay | FF7D | DJNZ PlaySounds_Building_Delay | Decrease counter by one and loop back to PlaySounds_Building_Delay until counter is zero. | |
| FF7F | DEC HL | Decrease HL by one. | ||
| FF80 | LD A,H | Jump to PlaySounds_Building_Loop until HL is zero. | ||
| FF81 | OR L | |||
| FF82 | JR NZ,PlaySounds_Building_Loop | |||
| FF84 | RET | Return. | ||
| MelodyBuffer | FF85 | DEFB $00,$00 | ||
| FF87 | DEFB $00,$00 | |||
| FF89 | DEFB $00,$00 | |||
| FF8B | DEFB $00 | |||
| FF8C | DEFB $00 | |||
| MelodyID | FF8D | DEFB $00 | ||
| Table_Melodies | FF8E | DEFB $F4,$01,$00,$00,$32,$00,$0A,$01 | ||
| FF96 | DEFB $F4,$01,$00,$00,$F4,$01,$01,$02 | |||
| FF9E | DEFB $96,$00,$F4,$01,$C8,$00,$01,$02 | |||
| FFA6 | DEFB $64,$00,$19,$00,$64,$00,$04,$00 | |||
| FFAE | DEFB $E8,$03,$01,$00,$E8,$03,$05,$01 | |||
| FFB6 | DEFB $E8,$03,$01,$00,$F4,$01,$06,$01 | |||
| FFBE | DEFB $96,$00,$2C,$01,$C8,$00,$01,$02 | |||
| FFC6 | DEFB $42,$00,$00,$3C,$42,$42,$42,$42 | |||
| FFCE | DEFB $3C,$00,$00,$7C,$42,$42,$7C,$40 | |||
| FFD6 | DEFB $40,$00,$00,$3C,$42,$42,$52,$4A | |||
| FFDE | DEFB $3C,$00,$00,$7C,$42,$42,$7C,$44 | |||
| FFE6 | DEFB $42,$00,$00,$3C,$40,$3C,$02,$42 | |||
| FFEE | DEFB $3C,$00,$00,$FE,$10,$10,$10,$10 | |||
| FFF6 | DEFB $10,$00,$00,$42,$42,$42,$42,$42 | |||
| FFFE | DEFB $3C,$00 | |||
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