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Update ym2612.asm

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b1ackmai1er
2022-12-21 22:53:47 +08:00
parent bd03277bfe
commit 96269a7f45
1 changed files with 33 additions and 6 deletions
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39
Source/HBIOS/ym2612.asm
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@@ -261,7 +261,34 @@ YM_DURATION: LD (YM_PENDING_DURATION),HL ; SET TONE DURATION
; D = CHANNEL
;------------------------------------------------------------------------------
;
YM_PLAY: LD A,(YM_RDY_RST) ; IF STILL IN RESET
YM_PLAY: ld hl,ym_playnote+0
ld a,d ; 000 > 000 011 > 100
cp 3 ; 001 > 001 100 > 101
ld e,part1 ; 010 > 010 101 > 110
jr c,ch012
sub 3
ld d,a ; d = 0..2
add a,4
jr ch345 ; a = 4..6
ch012: ld e,part0
ch345: ld (hl),e
ld hl,ym_playnote+3 ; setup keyon channel
ld (hl),a
ld hl,ym_playnote+11 ; setup keyoff channel
or %11110000
ld (hl),a
ld a,$a4 ; setup frequency channel
add a,d ; msb
ld hl,ym_playnote+4
ld (hl),a
ld a,$a0 ; setup frequency channel
add a,d ; lsb
ld hl,ym_playnote+6
ld (hl),a
LD A,(YM_RDY_RST) ; IF STILL IN RESET
OR A ; STATE GO SETUP FOR
CALL Z,YM_MAKE_RDY ; PLAYING
;
@@ -298,11 +325,11 @@ YM_MAKE_RDY: CPL
;------------------------------------------------------------------------------
;
ym_playnote: .db part0, 10/2
.db $28, $00 ; [0] KEY OFF
.db $A4, $3F ; [0] Frequency MSB ; patch +5
.db $A0, $FF ; [0] Frequency LSB ; patch +7
.db $4C, $00 ; [0] Volume ; patch +9
.db $28, $F0 ; [0] KEY ON
.db $28, $00 ; [0] KEY OFF ; 00000111
.db $A4, $3F ; [0] Frequency MSB ; patch +5 ; A4+channel-1
.db $A0, $FF ; [0] Frequency LSB ; patch +7 ; A4+channel-1
.db $4C, $00 ; [0] Volume ; patch +9 ; 4C+channel-1
.db $28, $F0 ; [0] KEY ON ; 00000111
.db $00 ; End flag
;
;------------------------------------------------------------------------------