Following is the IBM mainframe evolution starting with the System/360 introduced in 1964. The IBM mainframe is the longest running computer family in history. Although current IBM mainframes are vastly superior in technology to the System/360, they are highly compatible with it. Programs written for the System/360 more than four decades ago may still run on the latest models with only minor modifications.
Year Model
Intro. Model Numbers
System/360
1964 System/360 2020 to 2195
System/370
1970 System/370 3115 to 3168
1977 System/370 3031, 3032, 3033
1979 System/370 43xx
1980 System/370 3081, 3083, 3084
1981 XA/370 3081, 3083, 3084
1986 XA/370 3090 series (120 to 600)
1986 XA/370 9370 series
1988 ESA/370 ES/3090 and ES/4381
System/390
1990 ESA/390 ES/9000, 120 to 9X2
1994 ESA/390 9672 Exx & Pxx, G1
1994 ESA/390 9672 Rx1, G1
1995 ESA/390 9672 Rx2,Rx3, G2
1996 ESA/390 Multiprise 2000 (2003-xxx)
1996 ESA/390 9672 Rx4, G3
1997 ESA/390 9672 Rx5, G4
1998 ESA/390 9672 Rx6-Yx6, G5
1998 ESA/390 9672 Y56-YX6, G5 Turbo
1999 ESA/390 9672 X17-XZ7, Z17-ZZ7, G6
1999 ESA/390 7060-xxx Multiprise 3000, G5
System z (z/Architecture)
2000 900 2064 series
2002 800 2066 series
2003 990 2084 series
2005 z9 EC 2094 series
2006 z9 BC 2096 series
2008 z10 EC 2097 series
2008 z10 BC 2098 series
2010 z196 2817 series
Even today, mainframes are hardly extinct. Organizations have billions of dollars invested in mainframe programming, and IBM has more than kept pace with advancements in semiconductor technology. (Image courtesy of International Business Machines Corporation. Unauthorized use not permitted.)
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