SSG part
File:Ym2610egshapes.pngSelectable 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
