215 lines
4.2 KiB
NASM
215 lines
4.2 KiB
NASM
;=======================================
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;
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; MSU-1 Enhanced Audio Patch
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; Zelda no Densetsu - Kamigami no Triforce
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; Modified for VT Randomizer
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;
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; Author: qwertymodo
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;
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; Free space used: 0x77DDD-0x77F8A
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;
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;=======================================
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!REG_MSU_STATUS = $2000
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!REG_MSU_ID_0 = $2002
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!REG_MSU_ID_1 = $2003
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!REG_MSU_ID_2 = $2004
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!REG_MSU_ID_3 = $2005
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!REG_MSU_ID_4 = $2006
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!REG_MSU_ID_5 = $2007
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!REG_MSU_ID_01 = $2002
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!REG_MSU_ID_23 = $2004
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!REG_MSU_ID_45 = $2006
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!VAL_MSU_ID_0 = #$53 ; 'S'
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!VAL_MSU_ID_1 = #$2D ; '-'
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!VAL_MSU_ID_2 = #$4D ; 'M'
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!VAL_MSU_ID_3 = #$53 ; 'S'
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!VAL_MSU_ID_4 = #$55 ; 'U'
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!VAL_MSU_ID_5 = #$31 ; '1'
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!VAL_MSU_ID_01 = #$2D53 ; 'S-'
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!VAL_MSU_ID_23 = #$534D ; 'MS'
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!VAL_MSU_ID_45 = #$3155 ; 'U1'
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!REG_MSU_TRACK = $2004
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!REG_MSU_TRACK_LO = $2004
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!REG_MSU_TRACK_HI = $2005
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!REG_MSU_VOLUME = $2006
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!REG_MSU_CONTROL = $2007
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!FLAG_MSU_PLAY = #$01
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!FLAG_MSU_REPEAT = #$02
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!FLAG_MSU_STATUS_TRACK_MISSING = #$08
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!FLAG_MSU_STATUS_AUDIO_PLAYING = #$10
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!FLAG_MSU_STATUS_AUDIO_REPEATING = #$20
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!FLAG_MSU_STATUS_AUDIO_BUSY = #$40
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!FLAG_MSU_STATUS_DATA_BUSY = #$80
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!REG_CURRENT_VOLUME = $0127
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!REG_TARGET_VOLUME = $0129
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!REG_CURRENT_MSU_TRACK = $012B
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!REG_MUSIC_CONTROL = $012C
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!REG_CURRENT_TRACK = $0130
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!REG_CURRENT_COMMAND = $0133
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!REG_MSU_LOAD_FLAG = $7F509B
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!REG_SPC_CONTROL = $2140
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!REG_NMI_FLAGS = $4210
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!VAL_COMMAND_FADE_OUT = #$F1
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!VAL_COMMAND_FADE_HALF = #$F2
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!VAL_COMMAND_FULL_VOLUME = #$F3
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!VAL_COMMAND_LOAD_NEW_BANK = #$FF
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!VAL_VOLUME_INCREMENT = #$10
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!VAL_VOLUME_DECREMENT = #$02
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!VAL_VOLUME_HALF = #$80
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!VAL_VOLUME_FULL = #$FF
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msu_main:
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SEP #$20 ; set 8-bit accumulator
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LDA $4210 ; thing we wrote over
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REP #$20 ; set 16-bit accumulator
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LDA !REG_MSU_ID_01
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CMP !VAL_MSU_ID_01
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BEQ .continue
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.nomsu
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SEP #$30
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JML spc_continue
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.continue
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LDA !REG_MSU_ID_23
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CMP !VAL_MSU_ID_23
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BNE .nomsu
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LDA !REG_MSU_ID_45
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CMP !VAL_MSU_ID_45
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BNE .nomsu
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SEP #$30
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LDX !REG_MUSIC_CONTROL
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BNE command_ff
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LDA !REG_MSU_LOAD_FLAG
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BEQ do_fade
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msu_check_busy:
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LDA !REG_MSU_STATUS
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BIT !FLAG_MSU_STATUS_AUDIO_BUSY
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BEQ .ready
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JML spc_continue
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.ready
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LDA !REG_MSU_STATUS
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BIT !FLAG_MSU_STATUS_TRACK_MISSING
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BNE spc_fallback
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LDA !VAL_VOLUME_FULL
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STA !REG_TARGET_VOLUME
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STA !REG_CURRENT_VOLUME
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STA !REG_MSU_VOLUME
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LDA !REG_MSU_LOAD_FLAG
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STA !REG_MSU_CONTROL
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LDA #$00
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STA !REG_MSU_LOAD_FLAG
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JML spc_continue
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spc_fallback:
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STZ !REG_MSU_CONTROL
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STZ !REG_CURRENT_MSU_TRACK
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STZ !REG_TARGET_VOLUME
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STZ !REG_CURRENT_VOLUME
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STZ !REG_MSU_VOLUME
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JML spc_continue
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do_fade:
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LDA !REG_CURRENT_VOLUME
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CMP !REG_TARGET_VOLUME
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BNE .continue
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JML spc_continue
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.continue
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BCC .increment
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.decrement
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SBC !VAL_VOLUME_DECREMENT
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BCS .set
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.mute
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STZ !REG_CURRENT_VOLUME
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STZ !REG_MSU_CONTROL
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STZ !REG_CURRENT_MSU_TRACK
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BRA .set
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.increment
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ADC !VAL_VOLUME_INCREMENT
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BCC .set
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LDA !VAL_VOLUME_FULL
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.set
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STA !REG_CURRENT_VOLUME
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STA !REG_MSU_VOLUME
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JML spc_continue
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command_ff:
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CPX !VAL_COMMAND_LOAD_NEW_BANK
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BNE command_f3
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JML spc_continue
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command_f3:
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CPX !VAL_COMMAND_FULL_VOLUME
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BNE command_f2
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STX !REG_SPC_CONTROL
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LDA !VAL_VOLUME_FULL
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STA !REG_TARGET_VOLUME
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JML spc_continue
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command_f2:
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CPX !VAL_COMMAND_FADE_HALF
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BNE command_f1
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STX !REG_SPC_CONTROL
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LDA !VAL_VOLUME_HALF
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STA !REG_TARGET_VOLUME
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JML spc_continue
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command_f1:
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CPX !VAL_COMMAND_FADE_OUT
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BNE load_track
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STX !REG_SPC_CONTROL
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STZ !REG_TARGET_VOLUME
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JML spc_continue
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load_track:
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CPX !REG_CURRENT_MSU_TRACK
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BNE .continue
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CPX #$1B
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BEQ .continue
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JML spc_continue
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.continue
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STX !REG_MSU_TRACK_LO
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STZ !REG_MSU_TRACK_HI
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STZ !REG_MSU_CONTROL
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LDA.l track_list,x
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STA !REG_MSU_LOAD_FLAG
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STX !REG_CURRENT_MSU_TRACK
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JML spc_continue
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ending_wait:
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rep #$20
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lda !REG_MSU_ID_01
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cmp !VAL_MSU_ID_01
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bne .done
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lda !REG_MSU_ID_23
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cmp !VAL_MSU_ID_23
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bne .done
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lda !REG_MSU_ID_45
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cmp !VAL_MSU_ID_45
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bne .done
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sep #$20
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.wait
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lda !REG_MSU_STATUS
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bit !FLAG_MSU_STATUS_AUDIO_PLAYING
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bne .wait
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.done
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sep #$20
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lda #$22
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rtl
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