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1st gen	8 bit	1972-1985
2nd gen	8 bit	1985-1988
3rd gen	16 bit	1988-1995
4th gen	32 bit	1995-1996
5th gen	64 bit	1996-2000
6th gen	N/A	2000-2005
7th gen	N/A	2005-2012
8th gen	N/A	2012-2017