Using The Sound Chip
If bank 3 is in area select mode and bit 5 of mode register is reset, the SCC can be activated by writing 3Fh to one address 9000h through 97FFh. The layout is very similar to the SCC and the meaning of the registers is the same although the address differ somewhat and the waveform of channel 5 can be read. The SCC is visible at 9800h through 9FDFh.
| Address | read/write | Function |
|---|---|---|
| 9800h - 981Fh | rw | waveform channel 1 |
| 9820h - 983Fh | rw | waveform channel 2 |
| 9840h - 985Fh | rw | waveform channel 3 |
| 9860h - 987Fh | rw | read: waveform channel 4 write: waveform channel 4 and 5 |
| 9880h - 9881h | w | frequency channel 1 |
| 9882h - 9883h | w | frequency channel 2 |
| 9884h - 9885h | w | frequency channel 3 |
| 9886h - 9887h | w | frequency channel 4 |
| 9888h - 9889h | w | frequency channel 5 |
| 988Ah | w | volume channel 1 |
| 988Bh | w | volume channel 2 |
| 988Ch | w | volume channel 3 |
| 988Dh | w | volume channel 4 |
| 988Eh | w | volume channel 5 |
| 988Fh | w | on/off switch channel 1 to 5 |
| 9890h - 989Fh | w | same as 9880h to 988Fh |
| 98A0h - 98BFh | w | waveform channel 5 |
| 98C0h - 98DFh | rw | deformation register |
| 98E0h - 98FFh | no function |
If bank 4 is in area select mode and bit 5 of the mode register is set, the SCC+ can be activated by writing a value with bit 7 set to anywhere to B000h through B7FFh. Now the SCC+ becomes active at B800h through BFDFh.
| Address | read/write | Function |
|---|---|---|
| B800h - B81Fh | rw | waveform channel 1 |
| B820h - B83Fh | rw | waveform channel 2 |
| B840h - B85Fh | rw | waveform channel 3 |
| B860h - B87Fh | rw | waveform channel 4 |
| B880h - B89Fh | rw | waveform channel 5 |
| B8A0h - B8A1h | w | frequency channel 1 |
| B8A2h - B8A3h | w | frequency channel 2 |
| B8A4h - B8A5h | w | frequency channel 3 |
| B8A6h - B8A7h | w | frequency channel 4 |
| B8A8h - B8A9h | w | frequency channel 5 |
| B8AAh | w | volume channel 1 |
| B8ABh | w | volume channel 2 |
| B8ACh | w | volume channel 3 |
| B8ADh | w | volume channel 4 |
| B8AEh | w | volume channel 5 |
| B8AFh | w | on/off switch channel 1 to 5 |
| B8B0h - B8BFh | w | same as B8A0h to B8AFh |
| B8C0h - B8DFh | rw | deformation register |
| B8E0h - B8FFh | no function |
Read more about this topic: Konami Sound Cartridge
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