Computer History By Radical Radish Aug 1, 1981 Sinclair ZX81 Aug 1, 1983 Atari 400 Aug 1, 1984 Memotech MTX512 Aug 1, 1985 BBC Model B Aug 1, 1988 Atari ST Aug 1, 1989 IBM PC XT Aug 1, 1990 IBM PC AT Aug 1, 1991 Tandon 386/20 Aug 1, 1992 386/33 Aug 1, 1995 486 Aug 1, 1996 Dell GX1 Aug 1, 1999 Dell Dimension P2 Aug 1, 2001 Dell Dimension P3 Aug 1, 2004 IBM T42 Aug 1, 2006 IBM T43 Aug 1, 2008 QX6600 Aug 1, 2012 Iphone 5