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mental.asm
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; -------------------------------
; Lyndon Sharp. LS-ENGINE
;
; SONG : MENTAL
; ---------------------------------
ORG $100
;Lyndon Sharp Beeper music engine
;Two channels of tone, no volume or timbre control, non-interrupting drums
;Originally written by Lyndon Sharp circa 1989
;Reverse-engineered from Zanthrax game and modified in 2011-12 by Shiru
;Modifications are:
; minor optimizations
; drum numbers changed
; notes shifted one semitone down
; TI modifications by utz 2012
begin
ld hl,music_Data
di
call play
ei
ret
play
ld e,(hl)
inc hl
ld d,(hl)
ld (ch0ptr),de
inc hl
ld e,(hl)
inc hl
ld d,(hl)
ld (ch0loop),de
inc hl
ld e,(hl)
inc hl
ld d,(hl)
ld (ch1ptr),de
inc hl
ld e,(hl)
inc hl
ld d,(hl)
ld (ch1loop),de
inc hl
ld a,(hl)
ld (speed),a
xor a
playSong
call playRow
; ld a,%10111111 ;7 + new keyhandler
; ld a,%10111111 ;7
; out (1),a ;11
; in a,(1) ;11 read keyboard
; nop ;4
; bit 6,a ;8
; ret z ;11/5 52/46+7
jr playSong
playRow
di
; ld ix,$2121 ;VZ - enable both tone channels (it is mask to xor with output) +
ld ix,$4040 ;MICROBEE - enable both tone channels (it is mask to xor with output) +
; ld ix,$1010 ;ZX - enable both tone channels (it is mask to xor with output) +
ld d,0
ch0ptr EQU $+1
ld hl,0 ;read byte from first channel pointer
ld c,(hl)
ld a,c
cp $ff
jr nz,noLoop
ch0loop EQU $+1
ld hl,0
ld (ch0ptr),hl
ch1loop EQU $+1
ld hl,0
ld (ch1ptr),hl
jr playRow
noLoop
and $3f
jr nz,noMute0 ;if it is zero, mute the channel -> ???
db $DD, $6a ; opcode for : ld ixl,d
noMute0
inc hl ;increase pointer
ld (ch0ptr),hl ;store pointer
ld e,a ;read divider from note table
ld hl,noteDivTable
add hl,de
ld a,(hl)
ld (ch0div),a ;set divider
ch1ptr EQU $+1
ld hl,0 ;the same for second channel
ld b,(hl)
ld a,b
and $3f ; +???
jr nz,noMute1
db $DD, $62 ; opcode for ld ixh,d
noMute1
inc hl
ld (ch1ptr),hl
ld e,a
ld hl,noteDivTable
add hl,de
ld a,(hl)
ld (ch1div),a
ld a,b ;now use note values to get drum number, four bits, lower always 0
rlca ;two top bits of note of second channel are top bits of the number
rlca
rl c ;and two top bits of note of first channel are lower bits
rla
add a,a
and $0f ;now there is drum number in A
ld e,a
ld hl,drumTable ;read drum parameters pointer from drum table
add hl,de
ld a,(hl)
inc hl
ld h,(hl)
ld l,a
ld (drumPtr),hl
ld a,$10
ld (drumParam0),a
ld a,$29
ld (drumParam1),a
ld l,a
xor a
ex af,af'
xor a
ld h,32
ld de, $4040 ; $2121 ;$0101 ; $2121 ;3333
exx
ld b,a
drumPtr EQU $+1
ld hl,0
ld e,$01
exx
speed EQU $+1
ld c,7
loop0
ld b,0
ploop1
ex af,af'
dec l
jr nz,$+3
xor a
push af ; +
xor 64
out (2), a
nop
nop
pop af
dec d
jr nz,delay0
ch0div EQU $+1
ld d,0
db $dd, $ad ; opcode for XOR IXL
drumParam0 EQU $+1
ld l,0
delay0ret
exx
ld c,a
ld a,b
push af ;+
xor 64
out (2), a
nop
pop af
dec e
jr nz,delay1
ld a,(hl)
or a
jp z,delay2
ld e,a
ld a,b
xor 64 ; +
inc hl
delay2ret
ld b,a
ld a,c
exx
ex af,af'
dec h
jr nz,$+3 ; +
xor a
push af
xor 64
out (2), a
nop
pop af
dec e
jr nz,delay3
ch1div EQU $+1
ld e,$9d
db $dd, $ac ; opcode for xor ixh
drumParam1 EQU $+1
ld h,017H
delay3ret
djnz ploop1
push af
ld a,(drumParam0)
dec a
ld (drumParam0),a
ld a,(drumParam1)
sub 3
ld (drumParam1),a
pop af
dec c
jp nz,loop0
exx
ei
ret
delay0 xor 0
jp delay0ret
delay1 ld (0),hl
delay2 ld r,a
jr delay2ret
delay3 xor 0
jp delay3ret
drumTable
dw drum0
dw drum1
dw drum2
dw drum3
dw drum4
dw drum5
dw drum6
dw drum7
drum0
db $00
drum1
db $05,$05,$0e,$0e,$17,$17,$2a,$17
db $2a,$17,$2a,$17,$2a,$17,$17,$0e
db $0e,$04,$04,$00
drum2
db $11,$08,$18,$06,$20,$09,$25,$0c
db $2a,$0a,$2e,$08,$32,$0a,$37,$0d
db $3d,$0b,$42,$09,$4c,$0b,$52,$0e
db $5a,$0c,$62,$0a,$69,$0c,$70,$0e
db $7b,$10,$89,$11,$96,$13,$9c,$15
db $70,$12,$12,$72,$72,$0c,$55,$0c
db $7a,$0b,$6d,$0b,$71,$0a,$74,$0a
db $77,$09,$7c,$06
drum3
db $05,$0a,$0f,$14,$1b,$20,$1b,$1e
db $10,$14,$17,$1a,$1d,$20,$2a,$36
db $42,$4f,$5c,$4f
drum4
db $47,$41,$0f,$0f,$09,$0c,$01,$0d
db $03,$05,$0e,$0c,$09,$06,$09,$0a
db $0e,$0f,$01,$0c,$04,$0e,$08,$09
db $06,$0b,$02,$02,$05,$06,$0c,$0b
db $00
drum5
db $0b,$06,$0d,$0a,$0f,$0e,$11,$12
db $13,$16,$15,$1a,$17,$1e,$19,$22
db $1b,$26,$1d,$00
drum6
db $11,$05,$17,$05,$20,$05,$23,$05
db $2a,$05,$2d,$05,$30,$05,$34,$05
db $3f,$05,$42,$05,$4c,$05,$52,$05
db $5f,$05,$65,$05,$69,$05,$6e,$05
db $7b,$05,$7f,$05,$84,$05,$9f,$05
db $65,$0f,$67,$19,$69,$23,$6b,$2d
db $6d,$37,$6f,$41,$71,$4b,$73,$55
db $75,$5f,$77
drum7
db $00
noteDivTable
db $00 ;no div for mute, shifts all the notes one semitone down compared to the original
db $fa,$eb,$de,$d2,$c6,$bb,$b0,$a6
db $9d,$94,$8c,$84,$7c,$75,$6f,$69
db $63,$5d,$58,$53,$4e,$4a,$46,$42
db $3e,$3b,$37,$34,$31,$2e,$2c,$29
db $27,$25,$23,$21,$1f,$1d,$1c,$1a
db $19,$17,$16,$15,$14,$12
;compiled music data
; MENTAL - by UTZ
;
music_Data
dw ptr1,loop1
dw ptr2,loop2
db $06
ptr1
db $18, $1b, $1f, $22, $18, $1b, $1f, $22, $18, $1b
db $1f
db $22
db $18
db $1b
db $1f
db $22
db $1b
db $1f
db $22
db $26
db $1b
db $1f
db $22
db $26
db $1b
db $1f
db $22
db $26
db $1b
db $1f
db $22
db $26
db $1f
db $22
db $26
db $29
db $1f
db $22
db $26
db $29
db $1f
db $22
db $26
db $29
db $1f
db $22
db $26
db $29
db $1d
db $24
db $27
db $2b
db $1d
db $24
db $27
db $2b
db $1d
db $20
db $24
db $2b
db $1d
db $24
db $20
db $1d
loop1
db $9a
db $1f
db $22
db $26
db $1a
db $1f
db $a2
db $26
db $9a
db $1f
db $a2
db $a6
db $1a
db $9f
db $22
db $a6
db $9b
db $1f
db $22
db $26
db $1b
db $1f
db $a2
db $26
db $9b
db $1f
db $a2
db $a6
db $1b
db $9f
db $22
db $26
db $98
db $1f
db $a2
db $a6
db $18
db $1f
db $a2
db $26
db $18
db $1f
db $a2
db $a6
db $18
db $9f
db $22
db $26
db $16
db $1f
db $22
db $26
db $16
db $1f
db $22
db $26
db $15
db $1f
db $22
db $26
db $15
db $1d
db $22
db $26
db $9a
db $1f
db $22
db $26
db $1a
db $1f
db $a2
db $26
db $9a
db $1f
db $a2
db $a6
db $1a
db $9f
db $22
db $a6
db $9b
db $1f
db $22
db $26
db $1b
db $1f
db $a2
db $26
db $9b
db $1f
db $a2
db $a6
db $1b
db $9f
db $22
db $26
db $98
db $1f
db $a2
db $a6
db $18
db $1f
db $a2
db $26
db $18
db $1f
db $a2
db $a6
db $18
db $9f
db $22
db $26
db $16
db $1f
db $22
db $26
db $16
db $1f
db $22
db $26
db $15
db $1f
db $22
db $26
db $15
db $1d
db $22
db $26
db $8e
db $8e
db $8e
db $8e
db $16
db $16
db $0c
db $0c
db $8e
db $8e
db $8e
db $8e
db $1a
db $1a
db $18
db $18
db $8e
db $0e
db $0e
db $0e
db $16
db $16
db $8c
db $0c
db $8e
db $8e
db $8e
db $8e
db $18
db $18
db $1b
db $1b
db $8e
db $0e
db $8e
db $8e
db $16
db $16
db $0c
db $0c
db $8e
db $8e
db $8e
db $8e
db $1a
db $1a
db $18
db $18
db $8e
db $0e
db $0e
db $0e
db $16
db $16
db $8c
db $0c
db $8e
db $8e
db $8e
db $8e
db $26
db $26
db $24
db $24
db $1a
db $1a
db $21
db $21
db $1a
db $1a
db $26
db $26
db $1a
db $1a
db $24
db $24
db $1a
db $1a
db $21
db $21
db $1a
db $1a
db $21
db $1f
db $1d
db $1c
db $00
db $1d
db $1d
db $00
db $1d
db $1c
db $1d
db $1c
db $9a
db $18
db $9a
db $9a
db $21
db $a1
db $9a
db $1a
db $26
db $26
db $1a
db $1a
db $24
db $24
db $1a
db $1a
db $21
db $21
db $1a
db $1a
db $21
db $1f
db $1d
db $1c
db $00
db $1d
db $1d
db $00
db $1d
db $1c
db $1d
db $1c
db $1a
db $18
db $1a
db $1a
db $21
db $21
db $1a
db $1a
db $26
db $26
db $1a
db $1a
db $24
db $24
db $1a
db $1a
db $21
db $21
db $1a
db $1a
db $21
db $1f
db $1d
db $1c
db $00
db $1d
db $1d
db $00
db $1d
db $1c
db $1d
db $1c
db $1a
db $18
db $9a
db $9a
db $21
db $a1
db $9a
db $1a
db $26
db $26
db $1a
db $1a
db $24
db $24
db $1a
db $1a
db $21
db $21
db $1a
db $1a
db $21
db $1f
db $1d
db $1c
db $00
db $1d
db $1d
db $00
db $1d
db $1c
db $1d
db $1c
db $9a
db $98
db $15
db $15
db $21
db $95
db $15
db $1a
db $26
db $26
db $9a
db $9a
db $24
db $a4
db $1a
db $1a
db $a1
db $21
db $9a
db $9a
db $21
db $9f
db $1d
db $1c
db $00
db $1d
db $9d
db $80
db $1d
db $9c
db $9d
db $1c
db $9a
db $18
db $95
db $95
db $21
db $95
db $15
db $1a
db $26
db $26
db $9a
db $9a
db $24
db $a4
db $1a
db $1a
db $a1
db $21
db $9a
db $9a
db $21
db $9f
db $1d
db $1c
db $00
db $1d
db $9d
db $80
db $1d
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ptr2
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loop2
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