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It contained approximately 1-mile (1.6 km) of wire, 280 dual-triode vacuum tubes, 31 thyratrons, and was about the size of a desk. It was not programmable, which distinguishes it from more general machines of the same era, such as Konrad Zuse 's 1941 Z3 (or earlier iterations) and the Colossus computers of 1943–1945.
The Z1 was a motor-driven mechanical computer designed by German inventor Konrad Zuse from 1936 to 1937, which he built in his parents' home from 1936 to 1938. [1] [2] It was a binary, electrically driven, mechanical calculator, with limited programmability, reading instructions from punched celluloid film.
The prototype, Colossus Mark 1, was shown to be working in December 1943 and was in use at Bletchley Park by early 1944. [1] An improved Colossus Mark 2 that used shift registers to run five times faster first worked on 1 June 1944, just in time for the Normandy landings on D-Day. [ 6 ]
PC-1 programs would work unmodified on the PC-3 and on the PC-8 with changes for screen size, and PC-4 (26-3650B) programs would run unmodified on the PC-5, PC-6 and PC-7. The PC-2 was a unique architecture and was the only unit in the line allowing direct memory access with POKE, PEEK and CALL.
Ahl later noted that “was far more books than there were computers around, so people were buying three, four, five of them for each computer.” [2] The second version, BASIC, was re-printed many times and was the first computer book to sell a million copies. Harry McCracken called it "The single most influential book of the BASIC era". [2]
The Raspberry Pi (Model 2B shown) is a low-cost single-board computer often used to teach computer science. [1]A single-board computer (SBC) is a complete computer built on a single circuit board, with microprocessor(s), memory, input/output (I/O) and other features required of a functional computer.
The Apple Computer 1 (Apple-1 [a]), later known predominantly as the Apple I (written with a Roman numeral), [b] is an 8-bit motherboard-only personal computer designed by Steve Wozniak [5] [6] and released by the Apple Computer Company (now Apple Inc.) in 1976.
ENIAC (/ ˈ ɛ n i æ k /; Electronic Numerical Integrator and Computer) [1] [2] was the first programmable, electronic, general-purpose digital computer, completed in 1945. [ 3 ] [ 4 ] Other computers had some of these features, but ENIAC was the first to have them all.