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IBM mainframes
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IBM mainframes
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


An Earlier IBM Mainframe Installation
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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