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 | ||
Line 6: | Line 8: | ||
|Subsystem=Turbo Sound Next | |Subsystem=Turbo Sound Next | ||
}} | }} | ||
− | |||
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. | ||
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! Bit !! Function | ! Bit !! Function | ||
|- | |- | ||
− | | 7 | Must be 1 | + | | 7 || Must be 1 |
− | | 6 | Enable left audio | + | |- |
− | | 5 | Enable right audio | + | | 6 || Enable left audio |
− | | 4-2 | Must be 1 | + | |- |
− | | 1-0 | Select active chip. 0-3: | + | | 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. | 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.