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・ macaulay
・ macbinary
・ macdesigner
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・ mace
・ mach
・ mach interface generator
・ machiavelli
・ machinable
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machine code
・ machine cycle
・ machine independent sail
・ machine language
・ machine learning
・ machoflops
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・ macintosh common lisp
・ macintosh file system
・ macintosh ii


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machine code : FOLDOC
machine code
The representation of a computer program which is actually read and interpreted by the computer. A program in machine code consists of a sequence of machine instructions (possibly interspersed with data). Instructions are binary strings which may be either all the same size (e.g. one 32-bit word for many modern RISC microprocessors) or of different sizes, in which case the size of the instruction is determined from the first word (e.g. Motorola 68000) or byte (e.g. {Inmos} transputer). The collection of all possible instructions for a particular computer is known as its "instruction set".
Execution of machine code may either be hard-wired into the central processing unit or it may be controlled by microcode. The basic execution cycle consists of fetching the next instruction from main memory, decoding it (determining which operation it specifies and the location of any arguments) and executing it by opening various gates (e.g. to al


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