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The System Unit of a Computer System - Coggle Diagram
The System Unit of a Computer System
Measurement of CPU Speed
Clock Rate
Gigahertz (Ghz)
Megahertz (Mhz)
1 Hertz = 1 clock cycle per second
Cache Memory
High-Speed Memory
Store data and instructions that have been recently used by the CPU
Integrated into a CPU or resided close to a CPU
Latest Technology of CPU
The future development of the CPU in the future has focused on the integration of more cores into CPU
Main Memory
2 Major types
Ramdom access memory (RAM)
Temporarily hold the data and instructions of application software and the operation system
Volatile
Access time is just a hundredth of hard disk
Measurement units: Bytes (B), Kilobytes (KB), Megabytes (MB), Gigabytes (GB), Terabytes (TB)
Access time is just a hundredth of hard disk
Two Main streams
Dynamic random access memory (DRAM)
Static random access memory (SRAM)
Read-only memory (ROM)
Store the permanent information supplied by the manufacturer
Contain the bootstrap program which loads and initializes the operation system of the computer
Store basic input/output system (BIOS)
Non-volatile
Variants of ROM
Erasable programmable RROM (EPROM)
Electrically erasable programmable ROM (EEPROM)
Use to stored data
memory chips installed on motherboard
Use to store instructions that CPU will execute
Accessible to the CPU of a computer without using other I/O channels