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include "moonsound.asm"
opl4writefm1
;e = register
;d = value
opl4_wait
ld a,e
out (MOON_REG1),a
opl4_wait
ld a,d
out (MOON_DAT1),a
ret
opl4writefm2
;e = register
;d = value
opl4_wait
ld a,e
out (MOON_REG2),a
opl4_wait
ld a,d
out (MOON_DAT2),a
ret
opl4writewave
;e = register
;d = value
opl4_wait
ld a,e
out (MOON_WREG),a
opl4_wait
ld a,d
out (MOON_WDAT),a
ret
opl4readwave
;e = register
opl4_wait
ld a,e
out (MOON_WREG),a
opl4_wait
in a,(MOON_WDAT)
ret
macro opl4_write_fm_regs
;e = base register
;d = value
;b = count
.loop
call opl4writefm1
call opl4writefm2
inc e
djnz .loop
endm
macro opl4_write_wave_regs
;e = base register
;d = value
;b = count
.loop
call opl4writewave
inc e
djnz .loop
endm
opl4init
ld de,0x0305
call opl4writefm2
ld b,0xda
ld de,0x0020
opl4_write_wave_regs
ld de,0x1bf8
call opl4writewave
ld de,0x1002
call opl4writewave
ld b,0xd6
ld de,0x0020
opl4_write_fm_regs
ld de,0x0001
call opl4writefm1
ld de,0x0008
call opl4writefm1
ld de,0x0004
jp opl4writefm2
opl4mute
ld de,0x8004
call opl4writefm1
ld de,0x0004
call opl4writefm1 ;stop timers
ld de,0x0004
call opl4writefm2
ld de,0x00bd
call opl4writefm1 ;rhythm off
ld b,0x16
ld de,0x0f80
opl4_write_fm_regs ;max release rate
ld b,0x16
ld de,0x3f40
opl4_write_fm_regs ;min total level
ld b,0x09
ld de,0x00a0
opl4_write_fm_regs ;frequency 0
ld b,0x09
ld de,0x00b0
opl4_write_fm_regs ;key off
ld b,0x18
ld de,0x4068
opl4_write_wave_regs ;key off, damp
ld de,0x0005
jp opl4writefm2
opl4setmemoryaddress
;dhl = memory address
ld e,0x03
call opl4writewave
ld d,h
inc e
call opl4writewave
inc e
ld d,l
jp opl4writewave
opl4readmemory
;bc = byte count
;dhl = memory address
;ix = buffer
call opl4setmemoryaddress
ld de,0x1102
call opl4writewave
opl4_wait
ld a,6
out (MOON_WREG),a
ld de,ix
ld a,c
dec bc
inc b
ld c,b
ld b,a
.readloop
opl4_wait
in a,(MOON_WDAT)
ld (de),a
inc de
djnz .readloop
dec c
jr nz,.readloop
ld de,0x1002
jp opl4writewave
opl4writememory
;bc = number of bytes
;dhl = memory address
;ix = buffer
call opl4setmemoryaddress
ld de,0x1102
call opl4writewave
opl4_wait
ld a,6
out (MOON_WREG),a
ld de,ix
ld a,c
dec bc
inc b
ld c,b
ld b,a
.writeloop
opl4_wait
ld a,(de)
out (MOON_WDAT),a
inc de
djnz .writeloop
dec c
jr nz,.writeloop
ld de,0x1002
jp opl4writewave