YM2610 registers

From NeoGeo Development Wiki
Revision as of 22:20, 25 February 2011 by Furrtek (talk | contribs) (Created page with "= SSG part = thumb|right|Selectable EG shapes of the SSG {| class="regdef" |'''Address (Z80 port 4)''' |'''Data (Z80 port 5)''' | |- |$00 |{{8BitRegi…")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

SSG part

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 - ModeVolume
Channel A
$09
Bit 7 6 5 4 3 2 1 0
Def - ModeVolume
Channel B
$0A
Bit 7 6 5 4 3 2 1 0
Def - ModeVolume
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 ONCH5 ONCH4 ONCH3 ONCH2 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