Fetch
A Macintosh program by Jim Matthews <[email protected]> for transferring files using File Transfer Protocol (FTP). Fetch requires a Mac 512KE, System 4.1, and either KSP 1.03 or MacTCP. Fetch is Copyright 1992, Trustees of Dartmouth College. ftp://ftp.Dartmouth.edu/pub/mac/Fetch_2.1.2.sit.hqx. ftp://src.doc.ic.ac.uk/computing/systems/mac/info-mac/comm/tcp.Last updated: 1994-11-30
fetch-execute cycle
The sequence of actions that a central processing unit performs to execute each machine code instruction in a program.
At the beginning of each cycle the CPU presents the value of the program counter on the address bus. The CPU then fetches the instruction from main memory (possibly via a cache and/or a pipeline) via the data bus into the instruction register. From the instruction register, the data forming the instruction is decoded and passed to the control unit which sends a sequence of control signals to the relevant function units of the CPU to perform the actions required by the instruction such as reading values from registers, passing them to the ALU to add them together and writing the result back to a register. The program counter is then incremented to address the next instruction and the cycle is repeated. The fetch-execute cycle was first proposed by John von Neumann.Last updated: 1998-06-25
Nearby terms:
Ferroelectric Random Access Memory ♦ Fetch ♦ fetch-execute cycle
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