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Some technical informations on hardware I want to share

MegaCD preservation
MegaCD preservation
Lot of informations aimed at CD drive preservention or replacement
Cartdrige 101
All you need to know about cartdrige and, mainly, the PCB and chips inside
Input 101
all you want to know!
How does a joypad 3 buttons work ?
How to read Sega mouse input ?
How to mod a justifier ?
Backup systems
list of known 'professional' backup systems
Homebrew cartdrige reader/writer
list of known 'home-made' cartdrige reader and/or flash card writer