TRS80-model4-1bit-music/outarun.asm at main · bushy555/TRS80-model4-1bit-music · GitHub

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	output "outarun.bin"

;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


	org #6000

	;test code

begin
	ld hl,music_data
	call play
	ret

	;engine code

play
	ld e,(hl)
	inc hl
	ld d,(hl)
	ld (playRow.ch0ptr),de
	inc hl
	ld e,(hl)
	inc hl
	ld d,(hl)
	ld (playRow.ch0loop),de
	inc hl
	ld e,(hl)
	inc hl
	ld d,(hl)
	ld (playRow.ch1ptr),de
	inc hl
	ld e,(hl)
	inc hl
	ld d,(hl)
	ld (playRow.ch1loop),de
	inc hl
	ld a,(hl)
	ld (playRow.speed),a

;	xor a
;	in a,(#1f)
;	or a
;	jr z,$+4
;	ld a,#ff
;	cpl
;	ld (playSong.checkKempston),a

playSong
	call playRow

;	xor a
;	in a,(#1f)
;.checkKempston=$+1
;	and 0
;	ret nz
;	xor a
;	in a,(#fe)
;	cpl
;	and #1f
;	ret nz

	jr playSong

playRow
	di
	ld ix,#0202		;enable both tone channels (it is mask to xor with output)
	ld d,0
.ch0ptr=$+1
	ld hl,0			;read byte from first channel pointer
	ld c,(hl)
	ld a,c
	cp #ff
	jr nz,.noLoop

.ch0loop=$+1
	ld hl,0
	ld (.ch0ptr),hl
.ch1loop=$+1
	ld hl,0
	ld (.ch1ptr),hl
	jr playRow

.noLoop
	and	#3f
	jr nz,.noMute0	;if it is zero, mute the channel
	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=$+1
	ld hl,0			;the same for second channel
	ld b,(hl)
	ld a,b
	and	#3f
	jr nz,.noMute1
	ld ixh,d
.noMute1
	inc	hl
	ld (.ch1ptr),hl
	ld e,a
	ld hl,noteDivTable
	add	hl,de
	ld a,(hl)
	ld (.ch1div),a
	ld a,b			;now use note values to get drum number, four bits, lower always 0
	rlca			;two top bits of note of second channel are top bits of the number
	rlca
	rl c			;and two top bits of note of first channel are lower bits
	rla
	add a,a
	and	#0f			;now there is drum number in A
	ld e,a
	ld hl,drumTable	;read drum parameters pointer from drum table
	add	hl,de
	ld a,(hl)
	inc	hl
	ld h,(hl)
	ld l,a
	ld (.drumPtr),hl
	ld a,#10
	ld (.drumParam0),a
	ld a,#29
	ld (.drumParam1),a
	ld l,a
	xor	a
	exa
	xor	a
	ld h,#10
	ld de,#0101
	exx
	ld b,a
.drumPtr=$+1
	ld hl,0
	ld e,#01
	exx
.speed=$+1
	ld c,7
.loop0
	ld b,0
.loop1
	exa
	dec	l
	jr nz,$+3
	xor	a
	out (#ff),a
	dec	d
	jr nz,.delay0
.ch0div=$+1
	ld d,0
	xor ixl
.drumParam0=$+1
	ld l,0
.delay0ret:
	exx
	ld c,a
	ld a,b
	and 2
	out	(#ff),a
	dec	e
	jr nz,.delay1
	ld a,(hl)
	or a
	jp z,.delay2
	ld e,a
	ld a,b
	xor	#2
	inc	hl
.delay2ret:
	ld b,a
	ld a,c
	exx
	exa
	dec	h
	jr nz,$+3
	xor	a
	out	(#ff),a
	dec	e

	jr nz,.delay3
.ch1div=$+1
	ld e,#9d

	xor ixh
.drumParam1=$+1
	ld	h,#17
.delay3ret
	djnz .loop1
	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

	ld hl,#2758
	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

music_data
	dw .ptr1,.loop1
	dw .ptr2,.loop2
	db #04
.ptr1
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #05
	db #05
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #9a
	db #00
	db #1a
	db #00
	db #80
	db #00
	db #18
	db #00
	db #98
	db #00
	db #80
	db #00
	db #96
	db #00
	db #16
	db #00
	db #80
	db #00
	db #11
	db #80
	db #91
	db #00
	db #13
	db #00
	db #93
	db #00
	db #80
	db #00
	db #93
	db #00
	db #00
	db #00
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #05
	db #05
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #9a
	db #00
	db #1a
	db #00
	db #80
	db #00
	db #18
	db #00
	db #98
	db #00
	db #80
	db #00
	db #96
	db #00
	db #16
	db #00
	db #80
	db #00
	db #11
	db #80
	db #91
	db #00
	db #13
	db #00
	db #93
	db #00
	db #80
	db #00
	db #93
	db #00
	db #00
	db #00
	db #8f
	db #0f
	db #00
	db #0f
	db #8f
	db #00
	db #0f
	db #0f
	db #80
	db #00
	db #00
	db #00
	db #80
	db #00
	db #11
	db #11
	db #93
	db #13
	db #00
	db #13
	db #93
	db #00
	db #13
	db #13
	db #80
	db #00
	db #00
	db #00
	db #80
	db #00
	db #14
	db #14
	db #16
	db #16
	db #00
	db #16
	db #16
	db #00
	db #16
	db #16
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #18
	db #18
	db #1b
	db #1b
	db #00
	db #1b
	db #1b
	db #00
	db #1b
	db #1b
	db #80
	db #00
	db #80
	db #00
	db #80
	db #00
	db #80
	db #00
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #05
	db #05
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #9a
	db #00
	db #1a
	db #00
	db #00
	db #00
	db #18
	db #00
	db #98
	db #00
	db #80
	db #00
	db #16
	db #00
	db #16
	db #00
	db #80
	db #00
	db #11
	db #00
	db #11
	db #00
	db #13
	db #00
	db #93
	db #00
	db #80
	db #00
	db #13
	db #00
	db #00
	db #00
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #05
	db #05
	db #87
	db #07
	db #00
	db #07
	db #07
	db #00
	db #07
	db #07
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #9a
	db #00
	db #1a
	db #00
	db #00
	db #00
	db #18
	db #00
	db #98
	db #00
	db #80
	db #00
	db #16
	db #00
	db #16
	db #00
	db #80
	db #00
	db #11
	db #00
	db #11
	db #00
	db #13
	db #00
	db #93
	db #00
	db #80
	db #00
	db #13
	db #00
	db #00
	db #00
	db #8f
	db #0f
	db #00
	db #0f
	db #8f
	db #00
	db #0f
	db #0f
	db #80
	db #00
	db #00
	db #00
	db #80
	db #00
	db #11
	db #11
	db #93
	db #13
	db #00
	db #13
	db #93
	db #00
	db #13
	db #13
	db #80
	db #00
	db #00
	db #00
	db #80
	db #00
	db #14
	db #14
	db #16
	db #16
	db #00
	db #16
	db #16
	db #00
	db #16
	db #16
	db #00
	db #00
	db #00
	db #00
	db #00
	db #00
	db #18
	db #18
	db #1b
	db #1b
	db #00
	db #1b
	db #1b
	db #00
	db #1b
	db #1b
	db #80
	db #00
	db #80
	db #00
	db #80
	db #00
	db #80
	db #00
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