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After IBM 704 computer was released on the machine IBM 709, which in architectural terms of approaching vehicles of the second and third generations. In this machine was first used indirect addressing, and first appeared channels input – output. In 1956, developed by IBM floating magnetic head on an air cushion. The invention has allowed them to create a new type of memory – disk storage, the significance of which was fully evaluated in the following decades the development of computer technology. The first memory disks appeared in the machines and the IBM 305 RAMAC – The latter had a package consisting of 50 metal discs with a magnetic coating, which revolved at a speed of 12000 rpm. On the surface of the disc was located 100 tracks for recording data on 10000 characters each. After the first serial computer UNIVAC – 1 company Remington – Rand in 1952, has released a computer UNIVAC – 1103, who worked 50 times faster. Later in the computer UNIVAC – 1103 were first used software interrupts. Employees of the firm Remington – Rand used the algebraic notation of algorithms called”Short Cocle”(the first interpreter created in 1949 by John Mauchli). In addition, it should be noted the U.S. Navy officer and head of the group of programmers at the time of Captain (later the only woman in a Navy Admiral) Grace Hopper, who first developed the program, the compiler of A-AO (Incidentally, the term “compiler” was first introduced Mr. . Hopper in 1951). This produced a compiler program into machine language translation of the entire program, written in easy to handle algebraic form.