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Earshaver_album_track02.asm
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Earshaver_album_track02.asm
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; Earshaver 1-bit Album, by Shiru. 2023.
;
; 01_adventure_time.1tm
; 02_traffic_lights.1tm
; 03_perfect_shitstorm.1tm
; 04_alphabeard.1tm
; 05_ear_shaver.1tm
; 06_spinning_bits.1tm
; 07_facemelter.1tm
; 08_burning_bright.1tm
; 09_balls_of_steel.1tm
; 10_kinda_loud.1tm
; 11_noise_in_my_head.1tm
;
; Originally for ZX Spectrum.
; Simple changeover to Microbee by dave.
; Microbee speaker hangs off port 2. Bit 6 drives the speaker.
;
; Assembly with SJASMPLUS.
; sjasmplus %1.asm
;
; Load into MAME/MESS with standard Microbee 32k ROM.
; Devices --> Quickload --> mount --> Select *.COM file.
; CP/M .COM files for Microbee loads in at $100 in memory, and will autoplay.
;
output "Earshaver_album_track02.com"
org $100
begin
ld hl,music_data
call play
ret
;music data format
;two bytes absolute pointer to drumParam table, then song data follows
;row length and flags byte
;%Frrrrrrr
; r=row length 0..127, F is special event flag
; 00=end of song data
;if F flag is set, check the lowest bit, it is engine change or drum pointer
; RD00EEE1 is engine change
; R=phase reset flag (always set for engines 0 and 5)
; E=engine number*2 (0,2,4,6,8,10,12,14)
; D=drum flag, if set, the drum param pointer follows
; xxxxxxx0 is drum pointer, this is LSB, MSB follows
;two note fields follows after the speed byte and optional bytes:
;$00 empty field, $01 rest note, otherwise MSB/LSB word of the divider/duty/phase
;drum param table follows, entries always aligned to 2 byte (lowest bit is zero):
; 2 byte pointer to the sample data, complete with added offset in frames
; 1 byte frames to be played (may vary depending on the offset)
; 1 byte volume 0..3 *3
; 1 byte pitch 0..8 *3
OP_NOP=$00
OP_XORA=$af
OP_RLCD=$02
OP_SBCAA=$9f
play:
di
push iy
exx
push hl
exx
ld c,(hl)
inc hl
ld b,(hl)
inc hl
ld (drumParam),bc
push hl ;put song ptr to stack
;hl acc1
;de add1
;bc sample counter
;hl' acc2
;de' add2
;b' squeeker output acc
;c' always 64
;a' phaser output bit
ld ix,0 ;ModPhase lfo's, ixh=ch1 ixl=ch2
ld hl,0 ;acc2
ld de,0 ;add2
ld b,0 ;squeker output acc
ld c,64 ;output bit mask
ld a, 64
exx
ld hl,0 ;acc1
ld de,0 ;add1
; xor a
ld a, 64
ex af,af' ;phaser output bit
playRow:
ex (sp),hl ;get song ptr, store acc1
loopRow:
ld a,(hl) ;row length and flags
inc hl
or a
jp nz,setRowLen
ld a,(hl) ;go loop
inc hl
ld h,(hl)
ld l,a
jp loopRow
setRowLen:
push af ;row length
jp p,readNotes
ld a,(hl)
inc hl
bit 0,a
jp nz,engineChange
ld c,a
jp drumCall
engineChange:
push af
push hl
ld (phaseReset1),a ;>=128 means it uses phase reset
ld (phaseReset2),a
ld hl,engineList
and $3e
add a,l
ld l,a
jr nc,$+3
inc h
ld a,(hl)
inc hl
ld h,(hl)
ld l,a
ld (engineJump),hl
pop hl
pop af
and $40
jr z,readNotes
ld c,(hl)
inc hl
drumCall:
call playDrum
readNotes:
pop af
and $7f
ld b,a ;row time*256/4 for better time resolution
ld c,0
srl b
rr c
srl b
rr c
ld a,(hl) ;ch1
inc hl
or a
jr z,skipCh1
dec a
jp nz,noteCh1
;mute ch1
ld (tt_duty1),a ;reset duty1
ld (ttev_duty1),a
ld (ttqn_duty1),a
ld (sq_duty1),a
ld (mod_mute1),a ;nop
ld (mod_alt1),a
pop de ;get acc1 off the stack
ld d,a ;reset add1
ld e,a
push de ;put acc1 back to the stack, now it is zero
jp skipCh1
noteCh1:
inc a
ld d,a
rra ;duty1 for squeeker
rra
rra
and $0e
add a,a
inc a
ld (sq_duty1),a
ld a,d
and $f0 ;duty1 for tritone
cp $80
jr nz,$+5 ;reset phase for ModPhase's non-zero W
ld ixh,$80
ld (tt_duty1),a
ld (ttev_duty1),a
ld (ttqn_duty1),a
add a,a
ld (mod_alt1),a
ld a,OP_SBCAA
ld (mod_mute1),a
jp z,noPhase1 ;phase reset
phaseReset1=$+1
ld a,0 ;
rla ;
jr nc,noPhase1 ;
ld a,d ;
and $f0 ;
sub $80 ;to keep compatibility
ex (sp),hl ;set phase
ld h,a ;
ld l,0 ;
ex (sp),hl ;
noPhase1:
ld a,d
and $0f
ld d,a ;add1 msb
ld e,(hl) ;add1 lsb
inc hl
skipCh1:
ld a,(hl) ;ch2
inc hl
or a
jr z,skipCh2
dec a
jp nz,noteCh2
;mute ch2
ld (tt_duty2),a ;reset duty2
ld (ttev_duty2),a
ld (ttln_duty2),a
ld (sq_duty2),a
ld (mod_mute2),a ;nop
exx
ld h,a ;reset acc2
ld l,a
ld d,a ;reset add2
ld e,a
exx
add a,a
ld (mod_alt2),a
jp skipCh2
noteCh2:
inc a
exx
ld d,a
rra ;duty2 for squeeker
rra
rra
and $0e
add a,a
inc a
ld (sq_duty2),a
ld a,d
and $f0 ;duty2 for tritone
cp $80
jp nz,$+5 ;reset phase for ModPhase's non-zero W
ld ixl,$80
ld (tt_duty2),a
ld (ttev_duty2),a
ld (ttln_duty2),a
ld (mod_alt2),a
ld a,OP_SBCAA
ld (mod_mute2),a
jp z,noPhase2 ;phase reset
phaseReset2=$+1
ld a,0 ;
rla ;
jr nc,noPhase2 ;
ld a,d ;
and $f0 ;
sub $80 ;to keep compatibility
ld h,a ;set phase
ld l,0 ;
noPhase2:
ld a,d
and $0f
ld d,a ;add2 msb
exx
ld a,(hl)
inc hl
exx
ld e,a ;add2 lsb
exx
skipCh2:
ex (sp),hl ;get acc1, store song ptr
engineJump=$+1
jp 0
;Engine 1: EarthShaker-alike
soundLoopES:
add hl,de ;11
jr nc,soundLoopES1S ;7/12-+
xor a ;4 |
out ($02),a ;11 |
jp soundLoopES1 ;10---+-32t
soundLoopES1S:
jp $+3 ;10 |
jp $+3 ;10---+-32t
soundLoopES1:
exx ;4
add hl,de ;11
jr nc,soundLoopES2S ;7/12
ld a,c ;4
out ($02),a ;11
jp soundLoopES2 ;10
soundLoopES2S:
jp $+3 ;10
jp $+3 ;10
soundLoopES2:
exx ;4
dec bc ;6
ld a,b ;4
or c ;4
jr nz,soundLoopES ;12=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 2: Tritone-alike with two tone channels of uneven volume (33/87t)
soundLoopTT:
add hl,de ;11
ld a,h ;4
tt_duty1=$+1
cp $80 ;7
sbc a,a ;4
and 64 ;7
exx ;4
add hl,de ;11
out ($02),a ;11
ld a,h ;4
tt_duty2=$+1
cp $80 ;7
sbc a,a ;4
and 64 ;7
out ($02),a ;11
exx ;4
dec bc ;6
ld a,b ;4
or c ;4
jp nz,soundLoopTT ;10=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 3: Tritone-alike with two tone channels with even volumes (mostly, 58/62t)
soundLoopTTEV:
add hl,de ;11
ld a,h ;4
ttev_duty1=$+1
cp $80 ;7
sbc a,a ;4
and 64 ;7
out ($02),a ;11
exx ;4
add hl,de ;11
ld a,h ;4
ttev_duty2=$+1
cp $80 ;7
sbc a,a ;4
and 64 ;7
exx ;4
dec bc ;6
out ($02),a ;11
ld a,b ;4
or c ;4
jp nz,soundLoopTTEV ;10=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 4: Tritone-alike quiet tone channel, loud noise channel
soundLoopTTLN:
add hl,de ;11
rlc h ;8
ld a,h ;4
exx ;4
and c ;4
add hl,de ;11
out ($02),a ;11
ld a,h ;4
ttln_duty2=$+1
cp $80 ;7
sbc a,a ;4
and c ;4
out ($02),a ;11
exx ;4
ld a,r ;9 to align to 120t
dec bc ;6
ld a,b ;4
or c ;4
jp nz,soundLoopTTLN ;10=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 5: Tritone-alike quiet noise channel, loud tone channel
soundLoopTTQN:
add hl,de ;11
ld a,h ;4
ttqn_duty1=$+1
cp $80 ;7
sbc a,a ;4
exx ;4
and c ;4
add hl,de ;11
out ($02),a ;11
rlc h ;8
ld a,h ;4
and c ;4
out ($02),a ;11
exx ;4
ld a,r ;9 to align to 120t
dec bc ;6
ld a,b ;4
or c ;4
jp nz,soundLoopTTQN ;10=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 6: Phaser-alike, single channel, two oscillators controlled directly
soundLoopPHA:
ex af,af' ;4
add hl,de ;11
jr c,$+4 ;7/12-+
jr $+4 ;7/12 |
xor 64 ;7 -+19t
exx ;4
add hl,de ;11
jr c,$+4 ;7/12-+
jr $+4 ;7/12 |
xor 64 ;7 -+19t
out ($02),a ;11
exx ;4
ex af,af' ;4
ld a,r ;9 to align to 120t
dec bc ;6
ld a,b ;4
or c ;4
jp nz,soundLoopPHA ;10=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 7: Squeeker-alike, two tone channels with duty control
soundLoopSQ:
ld a,c ;correct the loop counter for the double 8-bit counter
dec bc
inc b
ld c,a
soundLoopSQ1:
add hl,de ;11
sbc a,a ;4
sq_duty1=$+1
and 8*2 ;7 (0..7 duty*2+1)
exx ;4
add a,b ;4
ld b,a ;4
add hl,de ;11
sbc a,a ;4
sq_duty2=$+1
and 8*2 ;7
add a,b ;4
ld b,$ff ;7
add a,b ;4
sbc a,b ;4
ld b,a ;4
sbc a,a ;4
and c ;4
out ($02),a ;11
exx ;4
nop ;4
dec c ;4 double 8-bit loop counter
jp nz,soundLoopSQ1 ;10=120t
dec b ;Sqeeker-like engines are much forgiving for floating loop times,
jp nz,soundLoopSQ1 ;so this is an acceptable compromise to fit the average loop time into 120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 8: CrossPhase, another PWM modulation engine similar to Phaser1, single channel, two oscillators controlled directly
soundLoopCPA:
add hl,de ;11
ld a,h ;4
exx ;4
add hl,de ;11
cp h ;4
exx ;4
sbc a,a ;4
and 64 ;7
out ($02),a ;11
jr $+2 ;12
jr $+2 ;12
jr $+2 ;12
dec bc ;6
ld a,b ;4
or c ;4
jp nz,soundLoopCPA ;10=120t
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
;Engine 9: ModPhase, PWM modulation engine, two tone channels of uneven volume with a mod alteration control
soundLoopMOD:
ld a,c ;correct the loop counter for the double 8-bit counter
dec bc
inc b
ld c,a
soundLoopMOD1:
add hl,de ;11
ld a,h ;4
mod_alt1=$+1
xor 0 ;7
cp ixh ;8
mod_mute1=$
sbc a,a ;4
exx ;4
add hl,de ;11
out ($02),a ;11
ld a,h ;4
mod_alt2=$+1
xor 0 ;7
cp ixl ;8
mod_mute2=$
sbc a,a ;4
out ($02),a ;11
exx ;4
nop ;4
nop ;4
dec c ;4 double 8-bit loop counter
jp nz,soundLoopMOD1 ;10=120t
inc ixh
inc ixl
dec b
jp nz,soundLoopMOD1
; in a,($02) ;check keyboard
; cpl
; and $1f
jp playRow
jp stopPlayer
stopPlayer:
pop hl ;song pointer/acc1 word, not needed anymore
pop hl ;restore HL'
exx
pop iy
ei
ret
engineList:
;engines 1,6,8 use the W column/top bits for phase reset, all others use it as duty cycle
dw soundLoopES ;1 EarthShaker-alike
dw soundLoopTT ;2 Tritone-alike with uneven volumes
dw soundLoopTTEV ;3 Tritone-alike with equal volumes
dw soundLoopTTLN ;4 Tritone-alike with quiet tone channel, loud noise channel
dw soundLoopTTQN ;5 Tritone-alike with quiet noise channel, loud tone channel
dw soundLoopPHA ;6 Phaser-alike (single channel)
dw soundLoopSQ ;7 Squeeker-alike
dw soundLoopCPA ;8 CrossPhase
dw soundLoopMOD ;9 ModPhase
;C=drum param number
playDrum:
push de
push hl
ld b,0
ld h,b
ld l,c
srl c
add hl,hl ;C already *2, another *2
add hl,bc ;+1 to have *5
drumParam=$+1
ld bc,0
add hl,bc
ld a,(hl) ;drum sample pointer, complete with precalculated offset
ld (drumPtr+0),a
inc hl
ld a,(hl)
ld (drumPtr+1),a
inc hl
ld a,(hl) ;frames to be played
ld (drumFrames),a
inc hl
ld a,(hl) ;volume*3
ld (drumVolume),a
inc hl
ld a,(hl) ;pitch*8
ld (drumPitch),a
drumVolume=$+1
ld a,0
ld hl,volTable
add a,l
ld l,a
jr nc,$+3
inc h
ld a,(hl)
inc hl
ld (drumVol01),a
ld (drumVol11),a
ld (drumVol21),a
ld (drumVol31),a
ld (drumVol41),a
ld (drumVol51),a
ld (drumVol61),a
ld (drumVol71),a
ld a,(hl)
inc hl
ld (drumVol02),a
ld (drumVol12),a
ld (drumVol22),a
ld (drumVol32),a
ld (drumVol42),a
ld (drumVol52),a
ld (drumVol62),a
ld (drumVol72),a
ld a,(hl)
ld (drumVol03),a
ld (drumVol13),a
ld (drumVol23),a
ld (drumVol33),a
ld (drumVol43),a
ld (drumVol53),a
ld (drumVol63),a
ld (drumVol73),a
drumPitch=$+1
ld a,0
ld hl,pitchTable
add a,l
ld l,a
jr nc,$+3
inc h
ld a,(hl)
inc hl
ld (drumShift0),a
ld a,(hl)
inc hl
ld (drumShift1),a
ld a,(hl)
inc hl
ld (drumShift2),a
ld a,(hl)
inc hl
ld (drumShift3),a
ld a,(hl)
inc hl
ld (drumShift4),a
ld a,(hl)
inc hl
ld (drumShift5),a
ld a,(hl)
inc hl
ld (drumShift6),a
ld a,(hl)
ld (drumShift7),a
drumPtr=$+1
ld hl,0
drumFrames=$+1
ld b,0
ld c,0
ld d,1
drumLoop:
;bit 0
ld a,(hl) ;7
and d ;4
jr nz,$+4 ;7/12-+
jr z,$+4 ;7/12 |
ld a,64 ;7 -+19t
out ($02),a ;11
drumVol01=$
nop ;4
out ($02),a ;11
drumVol02=$
nop ;4
out ($02),a ;11
drumShift0=$+1
rlc d ;8
nop ;4
drumVol03=$
nop ;4
out ($02),a ;11
nop ;4
nop ;4
dec c ;4
jp $+3 ;10=120t
;bit 1
ld a,(hl) ;7
and d ;4
jr nz,$+4 ;7/12-+
jr z,$+4 ;7/12 |
ld a,64 ;7 -+19t
out ($02),a ;11
drumVol11=$
nop ;4
out ($02),a ;11
drumVol12=$
nop ;4
out ($02),a ;11
drumShift1=$+1
rlc d ;8
nop ;4
drumVol13=$
nop ;4
out ($02),a ;11
nop ;4
nop ;4
dec c ;4
jp $+3 ;10=120t
;bit 2
ld a,(hl) ;7
and d ;4
jr nz,$+4 ;7/12-+
jr z,$+4 ;7/12 |
ld a,64 ;7 -+19t
out ($02),a ;11
drumVol21=$
nop ;4
out ($02),a ;11
drumVol22=$
nop ;4
out ($02),a ;11
drumShift2=$+1
rlc d ;8
nop ;4
drumVol23=$
nop ;4
out ($02),a ;11
nop ;4
nop ;4
dec c ;4
jp $+3 ;10=120t
;bit 3
ld a,(hl) ;7
and d ;4
jr nz,$+4 ;7/12-+
jr z,$+4 ;7/12 |
ld a,64 ;7 -+19t
out ($02),a ;11
drumVol31=$
nop ;4
out ($02),a ;11
drumVol32=$
nop ;4
out ($02),a ;11
drumShift3=$+1
rlc d ;8
nop ;4
drumVol33=$
nop ;4
out ($02),a ;11
nop ;4
nop ;4
dec c ;4
jp $+3 ;10=120t
;bit 4
ld a,(hl) ;7
and d ;4
jr nz,$+4 ;7/12-+
jr z,$+4 ;7/12 |
ld a,64 ;7 -+19t
out ($02),a ;11