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Basic computer operation
The operation of such a computer, once a
program and some data have been loaded into RAM, is as
follows. The first instruction is transferred from RAM
into the control unit and interpreted by the hardware
circuitry. For instance, suppose that the instruction is
a string of bits that is the code for LOAD 10. This
instruction loads the contents of memory location 10
into the ALU. The next instruction, say ADD 15, is
fetched. The control unit then loads the contents of
memory location 15 into the ALU and adds it to the
number already there. Finally, the instruction STORE 20
would store the sum in location 20. At this level the
operation of a computer is not much different
from that of a pocket calculator. In general, of course,
programs are not just lengthy sequences of LOAD, STORE,
and arithmetic operations. Most importantly, computer
languages include conditional instructions, essentially
rules that say, "If memory location satisfies
condition , do instruction number next, otherwise do
instruction ." This allows the course of a program
to be determined by the results of previous
operations--a critically important ability.
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Eagle
Computer - Buys and sells refurbished laptops and desktops.
TechnoFILE
- How to Buy a Computer - Article by Jim Bray on the
introduction to the world of computer shopping.
Computer Connection -
Obtains financing for active and retired military and civil
service personnel.
Holme Computer - Aktuelle
Informationen und Preise zu Notebooks, PC-Systemen,
Digitalkameras und Datenprojektoren. Verkauf, Service und
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- Information about a local co-op in Worcester, MA providing
free computer and internet access to children, adults and
seniors.
JET - Computer aide
and PBEM tool for Europa series of WWII games. Supports many
basic rules of the game system. Open source, Windows executable.
Fust-Computer - Biete
Neu- und Gebraucht-Geräte, Komponenten und ein Sortiment an
Computer-Zubehör.
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