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Chapter 2. How Hardware and Software Work Together. You Will Learn…. How hardware and software interact How system resources help hardware and software communicate How an OS relates to BIOS, device drivers, and applications Different ways an OS can launch applications.

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chapter 2

Chapter 2

How Hardware and Software Work Together

you will learn
You Will Learn…
  • How hardware and software interact
  • How system resources help hardware and software communicate
  • How an OS relates to BIOS, device drivers, and applications
  • Different ways an OS can launch applications
  • The intelligence of the computer
  • Determines what hardware is present
  • Decides how it is configured and used
  • Uses hardware to perform tasks
operating system os
Operating System (OS)
  • Controls hardware components that make up a computer
  • Provides an interface for users
functions of an os
Functions of an OS
  • Uses BIOS
  • Manages secondary and primary storage
  • Helps diagnose problems with hardware and software
  • Interfaces between hardware and software
  • Performs tasks the user requests
available operating systems

Windows 9x

Windows NT, Windows 2000, and Windows XP




Mac OS

Available Operating Systems
categories of pc software
Categories of PC Software
  • BIOS and device drivers
  • Operating system
  • Application software
the 8 bit and 16 bit isa slots
The 8-Bit and 16-Bit ISA Slots
  • 8-bit ISA bus
    • Older bus used on early PCs (1980s)
    • Had eight lines for data
  • 16-bit
    • Provide more memory addresses, DMA channels, and IRQs
interrupt request number irq
Interrupt Request Number (IRQ)
  • Line on a bus that a device needing service uses to alert the CPU
  • COM and LPT are preconfigured assignments of system resources that a device can use
memory addresses
Memory Addresses
  • Number assignments for memory locations
  • Hexadecimal numbers, often written in segment:offset form, assigned to RAM and ROM so that the CPU can access both
  • Example: C800:5, which is 819,205 in decimal
shadowing rom
Shadowing ROM
  • Process of copying programs from ROM to RAM for execution
i o addresses
I/O Addresses
  • Numbers the CPU can use to access hardware devices
  • Also called port addresses or ports
dma channels
DMA Channels
  • Provide a shortcut for a device to send data directly to memory, bypassing the CPU
how an os relates to other software
How an OS Relatesto Other Software
  • All interaction between software and hardware is by way of the CPU
  • CPU operates in two modes:
    • 16-bit (real mode)
    • 32-bit (protected mode)
  • OS must use same mode the CPU uses
real 16 bit and protected 32 bit operating modes
Real (16-Bit) and Protected (32-Bit) Operating Modes
  • Real mode
    • Single-tasking
    • 16-bit data path; 1 MB of memory addresses
  • Protected mode
    • Multitasking
    • 32-bit data data path; at least 4 GB of memory addresses
    • OS manages access to RAM and does not allow a program direct access to it
how an os uses real and protected modes
How an OS Uses Real and Protected Modes
  • OS must be in sync with the CPU
  • Applications must be compiled to run in either real or protected mode
  • Hybrid of real and protected mode used by older software written for Windows 3.x
general types of software that run on pcs
General Types of Software That Run on PCs
  • 16-bit DOS software
    • Designed to run in real mode as only program running and expecting direct access to hardware
  • 16-bit Windows software
    • Designed for Windows 3.x to run where other programs might also be running
  • 32-bit Windows software
    • Designed to run in protected mode with other software and can be loaded into extended memory
how an os uses system bios
How an OS Uses System BIOS
  • Contains programming instructions to run simple hardware devices (eg, keyboard and floppy disk drive)
  • Can be used to access the hard drive
  • Stored on ROM chips
how device drivers control hardware
How Device Drivers Control Hardware
  • Stored on the hard drive
  • Usually written for a particular OS
device drivers under windows 2000
Device Drivers underWindows 2000
  • Uses only 32-bit drivers
how an os launches applications
How an OS Launches Applications
  • Applications depend on an OS to:
    • Provide access to hardware resources
    • Manage its data in memory and secondary storage
    • Perform many background tasks
loading application software using the windows desktop
Loading Application Software Using the Windows Desktop
  • From the Start menu
  • Shortcut icon on the desktop
  • Run dialog box
  • Windows Explorer or My Computer
chapter summary
Chapter Summary
  • How operating system software controls several significant hardware devices
  • How an OS provides the interface that applications need to command and use hardware devices