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IBM 1620 data processing machine with IBM 1627 plotter, on display at the 1962 Seattle World's Fair. The IBM 1620 was a model of scientific minicomputer produced by IBM.It was announced on October 21, 1959, [1] and was then marketed as an inexpensive scientific computer. [2]
The IBM 1620, the Data General Nova, the HP 2100 series, and the NAR 2 each have such a multi-level memory indirect, and could enter such an infinite address calculation loop. The memory indirect addressing mode on the Nova influenced the invention of indirect threaded code .
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.
Typically a front-panel switch could cause the computer to single-step, that is run a single instruction and stop until the programmer pressed a button to execute the next instruction. An address stop could be set to stop a running program when it attempted to execute an instruction or access data at a specified address. The contents of ...
Early computers that were exclusively decimal include the ENIAC, IBM NORC, IBM 650, IBM 1620, IBM 7070, UNIVAC Solid State 80.In these machines, the basic unit of data was the decimal digit, encoded in one of several schemes, including binary-coded decimal (BCD), bi-quinary and two-out-of-five code.
Apple completely phased out the G4 series for desktop models after it selected the 64-bit IBM-produced PowerPC 970 processor as the basis for its PowerPC G5 series. The last desktop model that used the G4 was the Mac Mini. The last portable to use the G4 was the iBook G4, which was replaced by the Intel-based MacBook.
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In computer hardware, a word mark or flag is a bit in each memory location on some early variable word length computers (e.g., IBM 1401, 1410, 1620) used to mark the end of a word. [1] Sometimes the actual bit used as a word mark on a given machine is not called word mark , but has a different name (e.g., flag on the IBM 1620, because on this ...