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If you had the knowledge necessary to reverse-engineer HDL itself, you'd probably be better off writing a replacement from scratch, unless you have a tremendous amount of experience and/or talent at reverse-engineering executable code. The HD Homebrew Project thread has some discussion and pointers to already-existing framework code from just such an effort, so it's not even necessary to start from scratch at this point...
just steal sjeep's PC
no respect for those that dont respect...
that would be funny, and compatibility would be possible to increase by 100 times