High Quality Content by WIKIPEDIA articles! "z11" was an early name for the IBM zEnterprise 196 mainframe computer. See IBM zEnterprise System for more information about that "z11" or "zNext". The Z11 was a computer, the first serially-produced machine of the Zuse KG. Weighing 800kg, in 1955 it was built with relays and stepwise relays. Beginning in 1957 the Z11 could be programmed by punched tapes. It consumed 2000W of electricity, and operated mechanically at a frequency of 10 to 20 Hz. Both input and output were in decimal numbers, and it used floating point arithmetic.

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