Florida History of IBM mainframes, 1952–present Market name 700/7000 series 1400 series System/360 System/370 30XX series (303X, 308X, 3090) System/390 eServer zSeries (900, 800; 990, 890) System z9 System z10 zEnterprise System (z196, zEC12) IBM Z (z13, z14, z15, z16) Architecture System/360 System/370 S/370-XA ESA/370 ESA/390 z/Architecture Template documentation