Difference between revisions of "Turbo Sound Next Control"
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(Created page with "{{Port |Number=$FFFD |ShortDesc=Controls stereo channels and selects active sound chip. |Readable=No |Writable=Yes |Subsystem=Turbo Sound Next }}") |
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{{Port | {{Port | ||
|Number=$FFFD | |Number=$FFFD | ||
| − | |ShortDesc=Controls stereo channels and selects active sound chip. | + | |NumberDec=65533 |
| + | |PortMask=%11-- ---- ---- --0- | ||
| + | |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 | ||
}} | }} | ||
| + | When written to with the top bit set, selects the active sound chip. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! 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. | ||
Latest revision as of 12:48, 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.