وحدة الذاكرة الرئيسة Main memory

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Main memory includes ROM, RAM, and cache memory. ROM stores permanent instructions for starting up the computer and is non-volatile, while RAM is volatile and stores active programs and data. Cache memory is high-speed memory between the CPU and RAM that stores frequently used data to improve processing speed.

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Main Memory





ROM .1
RAM .2
Cache Memory .3

ROM


RAM 

(BIOS ROM )
BIOS ROM 
Award Software American Megatrend
BIOS ROM 
(BIOS)

ROM 
EEPROM
Flash BIOS

EEPROM
ROM 



Flash BIOS


EEPROM

ROM
CPU 
BIOS
: (POST) POWER-ON SELF-TEST 

POST 

(Booting)

BIOS
BIOS
ROM

RAM




RAM 
(SRAM) RAM
(DRAM) RAM

RAM

(Flip-Flops)
(Cache Memory)




RAM
DRAM 
SRAM


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وحدة الذاكرة الرئيسة Main memory

1. Main Memory    ROM .1 RAM .2 Cache Memory .3

2. ROM  RAM  (BIOS ROM ) BIOS ROM  Award Software American Megatrend BIOS ROM  (BIOS) ROM  EEPROM Flash BIOS

3. EEPROM ROM  

4. Flash BIOS  EEPROM

5. ROM CPU  BIOS : (POST) POWER-ON SELF-TEST  POST  (Booting)  BIOS BIOS ROM

6. RAM   RAM  (SRAM) RAM (DRAM) RAM

7. RAM  (Flip-Flops) (Cache Memory)  

8. RAM DRAM  SRAM 