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IBM 1620. A transistor computer, now often called a second-generation computer, [1] is a computer which uses discrete transistors instead of vacuum tubes.The first generation of electronic computers used vacuum tubes, which generated large amounts of heat, were bulky and unreliable.
Later IBM introduced the 7094/7044 Direct Coupled System; the 7044 handled spooling between its fast 1400-series peripherals and 1301 or 1302 disk files, and used data channel to data channel communication as the 7094's interface to spooled data, with the 7094 primarily performing computations. There is also a 7090/7040 DCS.
The 200-series I/O instructions were a Peripheral Data Transfer (PDT) and a Peripheral Control and Branch (PCB) [15] that explicitly implemented asynchronous I/O. The PDT specified a device address, a buffer address and the transfer operation to be started, while the PCB specified a device address, a branch address and set the operating mode or ...
It used a large number of valves (vacuum tubes). It had paper-tape input and was capable of being configured to perform a variety of Boolean logical operations on its data, [102] but it was not Turing-complete. Data input to Colossus was by photoelectric reading of a paper tape transcription of the enciphered intercepted message. This was ...
Computer data storage or digital data storage is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers. [1]: 15–16 The central processing unit (CPU) of a computer is
In early 1963, ICT was engaged in negotiations to buy the computer business of Ferranti.In order to sweeten the deal, Ferranti demonstrated to ICT the Ferranti-Packard 6000 (FP6000) machine, which had been developed by its Canadian subsidiary Ferranti-Packard, to a design known as Harriac that had been initiated in Ferranti by Harry Johnson and fleshed out by Stanley Gill and John Iliffe.
The 709/7090 series use Data Synchronizer Channels for high-speed input/output, such as tape and disk. The basic 7-bit [ b ] DSCs, e.g., 7607, execute their own simple programs from the computer memory that controls the transfer of data between memory and the I/O devices; the more advanced 9-bit [ c ] 7909 supports more sophisticated channel ...
The 128 registers of the high-speed "general register stack" ("integrated circuit registers" on the UNIVAC 1108 and UNIVAC 1106 models), map to the current data space in main storage starting at memory address zero. These registers include both user and executive copies of the A, X, R, and J registers and many special function executive registers.