With full compatibility of every system, containing system boards from every console all fully wired into a State of the Art PC mainboard with the dumps, stored on multiple raid configured hard drives.
Every joystick port from every system all fully wired into the mainboard, shared cd/dvd rom drives using only those drives that could be made to boot original discs if needed.

With a reprogrammable bios for every sytem which could be flashed with every single bios ever made even all the mod chips, ooooocchh!

You would really have a job making such a sytem
, but it could be made if you knew litterrally everything about everything. 

