Turbo Sound Next Control
From SpecNext Wiki
| Number | PortNumber::$FFFD |
|---|---|
| Decimal | NumberDec:: |
| Short desc. | ShortDesc::Controls stereo channels and selects active sound chip and sound chip channel. |
| Bit Mask | [[PortMask::%11-- ---- ---- --0-]] |
| Readable | Readable::No |
| Writable | Writable::Yes |
| Subsystem | 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.