Learnthat.com A+ Hardware Service Technician: System Architecture

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A+ Hardware Service Technician: System Architecture

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Common I/O Addresses

I/O Addresses are memory locations which provide an interface between the operating system and an I/O device. This is an important area of study for the exam.

Address (Hex)	Device
00-0F	DMA Controller
20-21	Interrupt Controller
40-43	Timer
1F0-1F8	Hard Disk Controller
200-20F	Joystick Controller
238-23B	Bus Mouse
278-27F	LPT2
2E8-2EF	COM4 Serial Port
2F8-2FF	COM2 Serial Port
300-30F	Ethernet Card
330-33F	MIDI Port
378-37F	LPT1 Port
3E8-3EF	COM3 Serial Port
3F0-3F7	Floppy Disk Controller
3F8-3FF	COM1 Serial Port

It's important you study and memorize the memory addresses, especially the COM ports.

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A+ Hardware Service Technician

I. Introduction to the System Architecture Course

Section 1
II. System Architecture Overview
III. Components of a Motherboard
IV. The CPU
V. Characteristics of a CPU
VI. CPU Sockets
Section 1 Review

Section 2
VII. BIOS & CMOS
VIII. Types of Memory
IX. Memory Packages
X. RAM's Integral Part of the Computer System
Section 2 Review

Section 3
XI. IRQs
XII. DMA Channels
XIII. Common I/O Addresses
XIV. Floppy Drives
Section 3 Review

Section 4
XV. Cable Connections
XVI. Serial vs. Parallel
XVII. Computer Port Identification
Section 4 Review

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