Pilihan binari yang sah di usa32 comments
Uk based forex signals
The Z1 was a mechanical computer designed by Konrad Zuse from to and built by him from to The Z1 was the first freely programmable computer in the world which used Boolean logic and binary floating-point numbers , however it was unreliable in operation. This computer was destroyed in the bombardment of Berlin in December , during World War II , together with all construction plans.
The Z1 was the first in a series of computers that Zuse designed. The Z1 contained almost all the parts of a modern computer, i. The Z1 was freely programmable via punched tape and a punched tape reader. The input tape unit read perforations in millimeter film. The Z1 was a bit floating-point value adder and subtracter, with some control logic to make it capable of more complex operations such as multiplication by repeated additions and division by repeated subtractions.
The Z1's instruction set had nine instructions and it took between one and twenty cycles per instruction. The Z1 had a word floating-point memory, where each word of memory could be read from — and written to — by the control unit. The mechanical memory units were unique in their design and were patented by Konrad Zuse in The machine was only capable of executing instructions while reading from the punched tape reader, so the program itself was not loaded in its entirety into internal memory in advance.
The input and output were in decimal numbers, with a decimal exponent and the units had special machinery for converting these to and from binary numbers.
The input and output instructions would be read or written as floating-point numbers. This feature of the Z3 is one of the most elegant in the whole design. It was a programmable computer, based on binary floating-point numbers and a binary switching system. It consisted completely of thin metal sheets, which Zuse and his friends produced using a jigsaw. Construction of the Z1 was privately financed. Zuse got money from his parents, his sister Lieselotte, some students of the fraternity AV Motiv cf.
Helmut Schreyer and Kurt Pannke a calculating machines manufacturer in Berlin to do so. Zuse constructed the Z1 in his parents' apartment; in fact, he was allowed to use the living room for his construction. In , Zuse quit his job in airplane construction in order to build the Z1. Zuse is said to have used "thin metal strips" and perhaps "metal cylinders" or glass plates to construct Z1. There were probably no commercial relays in it although the Z3 is said to have used a few telephone relays.
The Z2 used the mechanical memory of the Z1, but used relay-based arithmetic. The Z3 was experimentally built entirely of relays. The Z4 was the first attempt at a commercial computer, reverting to the faster and more economical mechanical slotted metal strip memory, with relay processing, of the Z2, but the war interrupted the Z4 development. The Z1 was never very reliable in operation due to poor synchronization due to internal and external stresses on the mechanical parts.
The original Z1 was destroyed by the Allied air raids in , but in Zuse decided to rebuild the machine. He constructed thousands of elements of the Z1 again, and finished rebuilding the device in From Wikipedia, the free encyclopedia. Origins and Foundations of Computing: A Science of Operations: Machines, Logic and the Invention of Programming. Geschichten der Informatik - Visionen, Paradigmen, Leitmotive. Springer-Verlag Berlin Heidelberg Computers designed by Konrad Zuse.
Wikimedia Commons has media related to Zuse Z1.