From Sonic Retro

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<forumuser name="Nemesis" /> Nemesis is known for his extensive research and discoveries in the hacking scene. He wrote comprehensive guides listing offsets for nearly everything in the original Sonic the Hedgehog and Sonic 2 ROM images and savestates, cracked an art compression scheme now named after him, wrote numerous compression and decompression tools for Mega Drive formats, and released the first split disassemblies. His prototype research is widely considered an important part in the progression in knowledge about the prototypes.

Currently, Nemesis is working on writing a new Genesis emulator, named Exodus, which aims for maximum accuracy and numerous debugging features. The initial announcement thread can be viewed
Sonic Retro

External link

Nemesis' Sonic Hacking Site (Web Archive)