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
When Tim Paterson became the "father
of DOS" at the age of 24 it should not have come as a great shock to anyone
who knew him well. Growing up with a father who was an electrical engineer says
Paterson, "I got a lot of exposure to electronics stuff at home." He also says
that he learned a lot by reading and simply by experimenting on his own. It was
not until he went off to the University of Washington, however, that he first
came into contact with PC's. His roommate bought one and let him play around
with it. At the same time, Paterson was working as a technician at a retail
computer store in the Seattle area. This position allowed him to begin trying
to design his own computer boards. more...