Just a little note, hopefully not too OT 
Many commercial DVDs can theoretically go to nowhere (although I am sure on normal operation they are just fine). I have seen many where IF gprm(x) == (whatever) then goto PGCN (whatever) and the PGC is empty.
Others include tests for button numbers that cascade thru, the last one going to a NOP at the end of the post commands of the PGC (which has no Next PGCN). A good example of this can be seen in the pictures of this thread.
Regards

Many commercial DVDs can theoretically go to nowhere (although I am sure on normal operation they are just fine). I have seen many where IF gprm(x) == (whatever) then goto PGCN (whatever) and the PGC is empty.
Others include tests for button numbers that cascade thru, the last one going to a NOP at the end of the post commands of the PGC (which has no Next PGCN). A good example of this can be seen in the pictures of this thread.
Regards
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