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[3] An estimated 65,000–75,000 Apple III computers were sold. [5] [3] The Apple III Plus brought this up to approximately 120,000. [3] Apple co-founder Steve Wozniak stated that the primary reason for the Apple III's failure was that the system was designed by Apple's marketing department, unlike Apple's previous engineering-driven projects. [6]
It was the world's first working programmable, fully automatic digital computer. [3] The Z3 was built with 2,600 relays , implementing a 22- bit word length that operated at a clock frequency of about 5–10 Hz . [ 1 ]
The machine executed 3 instructions and then a NOP (no op) to slow it down, as nearly every component was identical to the 90/30). Later a 90/40 model was added, with improved performance from a faster clock rate (cycle time of 500 ns vs 600 ns), pre-fetching of the next instruction , and greater maximum main memory capacity (1M vs 512K).
PDP-1 PDP-6 PDP-7 PDP-8/e PDP-11/40 PDP-12 PDP-15 (partial) PDP-15 graphics terminal with light pen and digitizing tablet. Programmed Data Processor (PDP), referred to by some customers, media and authors as "Programmable Data Processor," [1] [2] [3] is a term used by the Digital Equipment Corporation from 1957 to 1990 for several lines of minicomputers.
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A December demonstration prompted a grant for construction of the full-scale machine. [ 12 ] [ 13 ] The ABC was built and tested over the next two years. A January 15, 1941, story in the Des Moines Register announced the ABC as "an electrical computing machine" with more than 300 vacuum tubes that would "compute complicated algebraic equations ...
[3] The operating system used by the Odra 1204 is called SODA. It was designed to work on a small computer without magnetic storage and can run simultaneous loading and execution of programs. [4] An Odra 1204 computer was used by a team in Leningrad developing an ALGOL 68 compiler in 1976.
Colossus was a set of computers developed by British codebreakers in the years 1943–1945 [1] to help in the cryptanalysis of the Lorenz cipher.Colossus used thermionic valves (vacuum tubes) to perform Boolean and counting operations.