Jerry Stuckle wrote in news:m3nrfk$dii$1@dont-
email.me:

Such
clauses have been upheld in courts, which means the only thing you can
do is a "clean room" implementation, with no access, directly or
indirectly, to the original code.


That's interesting. There are people who have 'decapsulated; actual ROM's,
mainly for accurate gaming emulators. What's more, these are the less precise
4-operator chips used on Soundblaster card FM and such, not the 6-operator FM
of the DX7. Even then, I don't want to emulate every last digital artifact,
so I never took that route, or any of that info. All my enveklope generator
and scaling curves are my own extensions of basic logarithmic principles, not
of any procedure in any ROM. For one thing, Yamaha could not have fitted all
my code in their original data spaces. So I'm probably clean in that
respect.