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