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Since December, 2001, IBM designates all its mainframes with the name eserver zSeries, with the e depicted in IBM's well-known red trademarked symbol. Nonetheless, the term zSeries now popularly refers only to IBM's newest line of 64-bit mainframes, starting with the zSeries 900.
zSeries servers succeeded the IBM System/390 (S/390 for short). zSeries servers are the direct, lineal descendents of the IBM System/360, announced in 1964, and the 1970s System/370. Applications written for the 24-bit System/360 can still run, unmodified, on the newest zSeries 990 four decades later, with few exceptions.
Major features of the eserver zSeries family:
In May 2003, IBM announced the zSeries 990 family, which began shipping at the end of that October. These models promise nearly three times the total system capacity, four times the memory, and over four times the I/O and networking bandwidth of the z900 family.
The zSeries 990 Model D32 is currently the most powerful IBM mainframe computer available, reportedly capable of performing more than 9,000,000,000 instructions per second.
See also: List of IBM productsThe following is a list of products from the International Business Machines (IBM) office and data processing equipment company, spanning from early-to-mid-20th-century punched card machinery and typewriters, via mainframe computers and minicomputers, to, zAAPzAAP is the zSeries Application Assist Processor, a new mainframe processor introduced by IBM in 2004. zAAP engines are dedicated to running Java workloads under z/OS, accelerating performance. zAAPs are available for zSeries 990 and 890 servers (and pres
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