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#redirect [[sega:Nemesis compression]]
'''Nemesis compression''' is the method created by [[Sega]] to reduce the amount of space that graphics data takes up in a [[Sega Megadrive]] [[ROM]]. A decompression algorithm takes the compressed data, unpacks it and transfers it to the [[VRAM]]. The graphics can then be displayed on the screen. The Nemesis format is specifically designed for Megadrive graphics, as it relies on the length of the data being divisible by $20 (hex), which is the exact number of bytes in a single [[8x8 tile]]. Although Nemesis is also used for 16x16 [[block mappings]] in Sonic CD, because the data conforms to the $20 rule.
 
 
 
Nemesis compression is named after [[Nemesis]], the hacker who first discovered the format and created a program to decompress it. The format is used in numerous Megadrive games, especially [[Sonic the Hedgehog]] games.
 
 
 
==Games which use Nemesis compression==
 
*Bare Knuckle 2 (Beta)
 
*[[Flicky]] (Megadrive)
 
*[[Sonic & Knuckles]]
 
*[[Sonic CD]] ([[Mega CD]])
 
*[[Sonic Crackers]]
 
*[[Sonic Eraser]]
 
*[[Sonic the Hedgehog (Genesis)]]
 
*[[Sonic the Hedgehog 2]]
 
*[[Sonic the Hedgehog 3]]
 
 
 
[[Category:Hacking Information]]
 

Latest revision as of 13:06, 1 April 2010