| NOMENCLATURE |
CENTRAL PROCESSING UNIT, COMPUTER SYSTEM. THE CENTRAL PROCESSING UNIT
IS THE FOCAL POINT (THE HEART) OF THE COMPUTER SYSTEM. IT RECEIVES DATA
FROM INPUT UNITS AND FILE UNITS, CARRIES OUT A VARIETY OF ARITHMETIC
AND LOGICAL OPERATIONS ON THIS DATA, AND TRANSMITS RESULTS TO OUTPUT
AND FILE UNITS. IT IS TRADITIONAL, AND STILL CONVENIENT TO CONSIDER THE
CPU AS MADE UP OF THREE PRINCIPAL PARTS: THE MEMORY, OR MAIN MEMORY,
ABLE TO HOLD DATA AND HOLD ALL INSTRUCTIONS OF TH E PROGRAM REQUIRE TO
CARRY OUT A JOB; THE ARITHMETIC AND LOGIC UNIT WHERE ACTUAL
CALCULATIONS ARE PERFORMED; MAIN CONTROL UNIT, REQUIRED TO SUPERVISE.
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