Write Address Detailed Functions

AUDC0 (AUDC1)

These addresses write data into the audio control registers which control the noise content and additional division of the audio output.

                    D3 D2  D1 D0  Type of noise
                                  or division
                    0  0   0  0   set to 1
                    0  0   0  1   4 bit poly
                    0  0   1  0   div 15 -> 4
                                  bit poly
                    0  0   1  1   5 bit poly ->
                                  4 bit poly
                    0  1   0  0   div 2 : pure
                                  tone
                    0  1   0  1   div 2 : pure
                                  tone
                    0  1   1  0   div 31 : pure
                                  tone
                    0  1   1  1   5 bit poly ->
                                  div 2
                    1  0   0  0   9 bit poly
                                  (white noise)
                    1  0   0  1   5 bit poly
                    1  0   1  0   div 31 : pure
                                  tone
                    1  0   1  1   set last 4
                                  bits to 1
                    1  1   0  0   div 6 : pure
                                  tone
                    1  1   0  1   div 6 : pure
                                  tone
                    1  1   1  0   div 93 : pure
                                  tone
                    1  1   1  1   5 bit poly div
                                  6

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