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This chapter explores the various components of a system unit, including microprocessors, memory, and different types of microprocessors such as CISC and RISC. It also discusses the role of a system board in facilitating communication between devices and the functions of a microprocessor chip. Additionally, it provides an overview of output and input devices and different types of microprocessor chips.
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6 CHAPTER SYSTEM UNIT
Lecture Objectives • System unit components • Microprocessors • Memory • Microprocessor Details • Microprocessor Components • Main Types (CISC/ RISC) of Microprocessors • Word Size of a Microprocessor
System Board Allows I/O devices to communicate with the system unit.
System Board • Connects all components • Allows communication between devices • Main board or motherboard • Circuit board electronic components • Sockets • Slots • Bus lines
Microprocessor • Central Processing Unit (CPU ) • Two basic components • Control unit • Arithmetic and logic unit
The Microprocessor chip • Control Unit sends control signals to the rest of the devices like • Memory – reading/writing for instructions/data/results • Arithmetic Logic Unit • Other external devices – for input/output etc. • ALU performs arithmetic or logical operations
Program Problem Data Control Unit ALU Screen Printer Keyboard Mouse … The Microprocessor chip Output Devices Input Devices
Microprocessor Chips • Chip capacities are expressed in word sizes • Types of microprocessor chips • CISC chips: Complex instruction chips • Most widely used design • Used by Intel • RISC chips: Reduced instruction set computer chips • Uses fewer instructions • Design is simpler and less costly • Used by the PowerPC
Microprocessor & Small Server Chips • CISC Examples • Pentium III and Pentium IV are most recent forms • Intel, AMD and Cyrix III are popular vendors of CISC type • RISC Examples • Motorola’s PowerPC • Compaq's Alpha • Silicon Graphics' MIPS
Microprocessor Chips • Word size • Number of processed bits • Expresses chip capacity • Size of word determines power • 32 bit processor– 4 bytes at a time • 64 bit processor – 8 bytes at a time
Specialty Processors • Graphics coprocessors • Parallel processors • Smart cards
Technology Description from Intel Executives • Commentary by WILLIAM A. SWOPE, President Intel Architecture Group [video clip] • Commentary by MICHAEL J. FISTER, Vice President and General Manager, Enterprise Platforms Group [ Video clip]