An instruction cycle' (also called fetch-and-execute cycle,
fetch-decode-execute cycle, and FDX) is the time period during which a computer
processes a machine language instruction from its memory or the sequence of
actions that the central processing unit (CPU) performs to execute each machine
code instruction in a program.
The name fetch-and-execute cycle is commonly used. The instruction must be
main memory, and then executed by the CPU. This is fundamentally how
a computer operates, with its CPU reading and executing a series of instructions
written in its machine language. From this arise all functions of a computer
familiar from the user's end.
How does a computer process instructions?
The term instruction cycle refers to the process in which a
computer executes a single instruction. The instruction
cycle is repeated each time the computer excites an
instruction. The steps in the cycle are summarized in the
John Mauchly and Presper
Eckert was the first to design the computer; they are from the the University of Pennsylvania. The name of the computer
was ENIAC, which stood for Electronic Numerical Intergrator and Computer. It
filled 40 ,9 feet tall cabinets and had about 18,000 vacuum tubes with miles of
wiring this was designed for a weapon of war. It could calculate trajectories
for WWII artillery guns but because of it operating under the army secrecy it
was little known to the public only by computing circles, it was eventually
buried in history under controversy,
jealousy, and lawsuits. ENIAC, Eckert, and Mauchly were forgotten. They also
discovered the first Computer Company, but neither found fame nor fortune
because both men were poor businessmen and lousy marketers. The team that built
the first computer ate, slept, and lived with it. They ran into so many problems
from how to combine vacuum tubes together so they could count numbers without
making mistakes all the way down to how they could make supplies last. Finally
in 1946 this thing was completed<.