FYI,
There is an algorithm which, given a bit sequence, will generate the
smallest LFSR which can be used to generate it. It is called the
Berlekamp-Massey algorithm, and you can probably find an
implementation on the net.
This doesn't mean that the TIA used this LFSR to generate the
sequence, however. It seems like they used different clocking tricks
to get a lot of mileage out of a minimum of internal gates.
I never tried this stuff, but....
For example, here is some code:
http://calliope.uwaterloo.ca/~ggong/ECE710T4/massey.c
And here is a very technical publication that it's based on
http://www.cacr.math.uwaterloo.ca/hac/about/chap6.pdf
I know some of the MAME folks have used this algorithm to help
reverse-engineer noise generators in the past.
-Frank
----------------------------------------------------------------------------------------------
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
