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COMPUTER SYSTEM OVERVEIW - Coggle Diagram
COMPUTER SYSTEM OVERVEIW
FIVE BASIC COMPONENTS
INPUT UNIT
TAKES IN INPUT
OUTPUT UNIT
GIVES THE OUTPUT
CPU
ALU--CARRYS ARITHEMETIC PROCESSES
CONTROL UNIT--- RESPONSIBLE FOR CONTROLLING AND SUPERVISING THE PROCESSING
PRIMARY MEMORY
INTERNAL VOLATILE MEMORY WHERE DATA AND INSTRUCTION ARE STORED DURING PROCESSING
SECONDARY MEMORY
REFERS TO THE EXTERNAL STORAGE DEVICES WHICH PROVIDE PERMANENT MEMORY
RAM
DYNAMIC RAM
THESSE ARE MADE UP OF TRANSISTORS AND CAPACITORS --20 TO 70 NANOSECONDS TAKEN TO ACCES DATA
USED IN MAIN MEMORY
STATIC RAM
MADE UP OF FLIP FLOPS---ABOUT 10 NANO SECONDS\
USED IN SPECIALIZED APPLICATIONS
ROM
PROM -PROGRAMABLE ROM
USER PROGRAMABLE MEMORY
BURNT USING ROM BURNER
EPROM(ERASEBLE PROM) -
SAME AS PROM BUT CAN ERASE MANY TIMES , TAKES 20 MINUTES TO ERASE
EEPROM (ELECTRICALLY ERASABLE PROM)
ERASES VERY FASTER AND SELECTIVE BYTES CAN BE ERASED
FLASH EEPROM
MUCH FASTER THAN EEPROM BUT ERASES COMPLETLY
MASK ROM
PROGRAMMED BY MANUFRACTURER .
CACHE MEMORY
MEDIATER BTWN PRIMARY STORAGE ---SPPEDS UP THE PROCESS