TheLastStarFighter on 02 June 2014
NES. It established the gaming industry as we know it.
PS1 and N64 would probably be next on my list, they changed things on many levels - PS established Sony as the standard platform and made CD's the main format; while both systems pioneered polygon gaming, especially the N64 - which also brought analogue sticks.
After them it's Wii which really shook up the industry from standard evolution, even if we're seeing things move back in that direction now.
