Difference between revisions of "Turbo Sound Next Control"

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{{Port
 
{{Port
 
|Number=$FFFD
 
|Number=$FFFD
 +
|NumberDec=65533
 +
|PortMask=%11-- ---- ---- --0-
 
|ShortDesc=Controls stereo channels and selects active sound chip and sound chip channel.
 
|ShortDesc=Controls stereo channels and selects active sound chip and sound chip channel.
 
|Readable=No
 
|Readable=No
 
|Writable=Yes
 
|Writable=Yes
 
|Subsystem=Turbo Sound Next
 
|Subsystem=Turbo Sound Next
|PortMask=%11-- ---- ---- --0-
 
 
}}
 
}}
 
When written to with the top bit set, selects the active sound chip.  
 
When written to with the top bit set, selects the active sound chip.  

Latest revision as of 11:48, 4 May 2020

Number $FFFD
Decimal 65533
Short desc. Controls stereo channels and selects active sound chip and sound chip channel.
Bit Mask %11-- ---- ---- --0-
Readable No
Writable Yes
Subsystem Turbo Sound Next

When written to with the top bit set, selects the active sound chip.

Bit Function
7 Must be 1
6 Enable left audio
5 Enable right audio
4-2 Must be 1
1-0 Select active chip. 0-3: unused, AY3, AY2, AY1.


Otherwise, selects the register number to access from the active sound chip.