I derived these sequences for the 4, 5, and 9 bit TIA audio polynomials
by capturing the output from my 7800. I looked at waveform outputs for
various AUDC0 values.
Note these sequences differ from those in TIASound.cxx in the Stella
emulator. I believe my values are correct, although I have not yet
tried recompiling Stella with my values.
(see
http://www.newwaveinstruments.com/resources/articles/m_sequence_linear_feedback_shift_register_lfsr.htm
for a description of linear feedback shift registers, and the notation
for their characteristic sequences. )
AUDC0 = 1;
4 bit LFSR sequence [ 4 3 ]:
0 0 0 0 1 1 1 0 1 1 0 0 1 0 1
(TIASound.cxx has this in reverse time order).
AUDC0 = 9;
5 bit LFSR sequence [ 5 3 ]:
1 1 1 1 0 1 1 0 1 0 0 1 1 0 0 0 0 0 1 1 1 0 0 1 0 0 0 1 0 1 0
(TIASound.cxx has these bits inverted).
AUDC0 = 8;
9 bit LFSR sequence [ 9 5 ]:
1 1 1 1 1 1 1 1 0 1 1 1 1 0 1 1 1 0 0 1 1 1 1 0 1 1 0 0 0 1 1 0 1 0 1
0 1 0 0 1 1 1 1 0 0 1 0 0 0 0 1 0 1 1 0 0 1 0 0 0 1 1 0 1 1 1 0 1 0 1
1 1 1 0 1 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 0 0 1 1 0 1 1 0 1 1 0 1 0 0 1
0 0 0 0 0 0 1 1 0 1 1 0 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 1 1 1 1 1 0 0 1
1 1 0 0 1 1 0 1 0 1 1 1 0 0 1 0 1 1 0 1 0 0 0 0 0 0 0 1 0 1 1 1 0 1 0
0 1 1 1 0 0 0 1 0 1 0 0 1 1 0 1 0 0 1 1 0 0 0 0 1 1 1 0 0 0 0 0 1 0 0
0 1 0 1 1 1 1 1 0 0 1 0 1 0 0 1 0 0 1 0 0 0 1 0 0 1 1 1 1 1 0 1 0 0 1
0 1 0 0 0 0 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 0 1 0 1 1 0 1 0 1 0 0 0 0 1
1 0 1 0 0 0 1 0 0 0 1 1 1 1 1 1 0 0 0 1 1 0 0 0 1 0 1 1 0 1 1 0 0 0 0
1 0 1 0 0 0 1 0 1 0 1 1 1 0 1 1 0 1 1 1 1 0 0 1 1 0 0 0 1 1 1 1 0 1 0
0 0 0 1 0 0 1 0 0 1 1 0 0 1 0 1 1 1 1 0 0 0 1 0 0 0 0 1 1 1 1 0 0 0 0
0 0 0 0 0 1 1 1 1 1 0 0 0 0 1 0 0 0 0 0 1 1 1 0 1 0 0 0 1 1 0 0 1 1 0
1 1 1 1 1 0 1 1 0 1 0 1 1 0 0 0 1 0 0 1 0 1 1 1 0 0 0 0 1 1 0 0 0 0 0
1 1 0 0 1 0 0 1 1 1 0 1 0 1 0 1 1 0 1 1 1 0 0 0 1 1 1 0 0 1 0 0 1 0 1
0 1 0 0 0 1 1 1 0 1 1 0 0 1 1 1 0 1 1 1 0
(TIASound.cxx uses random numbers).
--
adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam/pgp.html
Will code for food. http://cuddlepuddle.org/~adam/resume.html
"The dinosaurs are not around today because they did not have a space program."
-- Arthur C. Clarke
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