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Difference between revisions of "Nemesis compression"

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(Sega Megadrive games which use Nemesis compression: Added all known games to list.)
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==Sega Megadrive games which use Nemesis compression==
 
==Sega Megadrive games which use Nemesis compression==
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*Alien Storm
 
*Bare Knuckle 2 (Beta)
 
*Bare Knuckle 2 (Beta)
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*Castle of Illusion
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*Columns
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*[[Dr. Robotnik's Mean Bean Machine]]
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*ESWAT
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*Fatal Labyrinth
 
*[[Flicky]]
 
*[[Flicky]]
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*Forgotten Worlds
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*Ghostbusters
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*Ghouls 'n' Ghosts
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*Golden Axe
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*Golden Axe 2
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*Golden Axe 3
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*[[Knuckles' Chaotix]] ([[32X]])
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*Mega Anser
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*Mercs
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*Moonwalker
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*Phantasy Star II ([[SegaNet]] text adventures)
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*PulseMan
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*Quackshot
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*Revenge of Shinobi
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*[[Ristar]]
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*Sega/Mega CD BIOS ([[Mega CD]])
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*Shadow Dancer
 
*[[Sonic & Knuckles]]
 
*[[Sonic & Knuckles]]
 
*[[Sonic CD]] ([[Mega CD]])
 
*[[Sonic CD]] ([[Mega CD]])
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*[[Sonic Compilation]] (menu)
 
*[[Sonic Crackers]]
 
*[[Sonic Crackers]]
 
*[[Sonic Eraser]]
 
*[[Sonic Eraser]]
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*[[Sonic Jam]] ([[Saturn]])
 
*[[Sonic the Hedgehog (Genesis)|Sonic the Hedgehog]]
 
*[[Sonic the Hedgehog (Genesis)|Sonic the Hedgehog]]
 
*[[Sonic the Hedgehog 2]]
 
*[[Sonic the Hedgehog 2]]
 
*[[Sonic the Hedgehog 3]]
 
*[[Sonic the Hedgehog 3]]
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*Streets of Rage
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*Streets of Rage 3
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*Strider
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*Super Hang-On
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*Super Monaco GP
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*World Cup Italia '90
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*World of Illusion
  
 
[[Category:Hacking Information]]
 
[[Category:Hacking Information]]

Revision as of 19:04, 28 March 2005

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.

Sega Megadrive games which use Nemesis compression