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SSG part File:Ym2610egshapes.png Selectable EG shapes of the SSG
Address (Z80 port 4)
Data (Z80 port 5)
$00
Bit 7
6
5
4
3
2
1
0
Def Fine tune
Channel A
$01
Bit 7
6
5
4
3
2
1
0
Def -
Coarse tune
$02
Bit 7
6
5
4
3
2
1
0
Def Fine tune
Channel B
$03
Bit 7
6
5
4
3
2
1
0
Def -
Coarse tune
$04
Bit 7
6
5
4
3
2
1
0
Def Fine tune
Channel C
$05
Bit 7
6
5
4
3
2
1
0
Def -
Coarse tune
$06
Bit 7
6
5
4
3
2
1
0
Def -
Noise tune
Noise channel
$07
Bit 7
6
5
4
3
2
1
0
Def -
/EN noise /EN A /EN B /EN C
$08
Bit 7
6
5
4
3
2
1
0
Def -
Mode Volume
Channel A
$09
Bit 7
6
5
4
3
2
1
0
Def -
Mode Volume
Channel B
$0A
Bit 7
6
5
4
3
2
1
0
Def -
Mode Volume
Channel C
$0B
Bit 7
6
5
4
3
2
1
0
Def Volume envelope period fine tune
$0C
Bit 7
6
5
4
3
2
1
0
Def Volume envelope period coarse tune
$0D
Bit 7
6
5
4
3
2
1
0
Def -
Volume envelop shape
See diagram.
If 'Mode' = 1, the EG is used instead of the 4bit volume value.
f = 8M / (Coarse*256 + Fine) ?
FM part ADPCM-A part 'Dump' in register $00 is the key on/off bit. Write 0 to start playing specified channels and write 1 to stop playing.
Address (Z80 port 6)
Data (Z80 port 7)
$00
Bit 7
6
5
4
3
2
1
0
Def Dump
- CH6 ON CH5 ON CH4 ON CH3 ON CH2 ON CH1 ON
$01
Bit 7
6
5
4
3
2
1
0
Def -
Master volume
$08~$0D (one for each channel)
Bit 7
6
5
4
3
2
1
0
Def L
R - Channel volume
$10~$15 (one for each channel)
Bit 7
6
5
4
3
2
1
0
Def Sample's start address/256 LSB
$18~$1D (one for each channel)
Bit 7
6
5
4
3
2
1
0
Def Sample's start address/256 MSB
$20~$25 (one for each channel)
Bit 7
6
5
4
3
2
1
0
Def Sample's stop address/256 LSB
$28~$2D (one for each channel)
Bit 7
6
5
4
3
2
1
0
Def Sample's stop address/256 MSB
ADPCM-B part
