Turbo Sound Next Control

Number	$FFFD
Decimal
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.