CST8174_Lecture_15_Introduction_BIOS

CST8174_Lecture_15_Introduction_BIOS - Algonquin College...

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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara CST8174 Computer Technology Basics BIOS RAM vs. ROM Address Space
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara The BIOS Basic Input Output System Also referred to as System ROM The system BIOS is stored on a ROM chip attached directly to the motherboard Allows a system to start, before having system memory loaded Contains hundreds of little programs to communicate with basic hardware devices
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara The BIOS The BIOS program is always located in the upper 64K of the first megabyte of system memory Located in the Upper Memory Area BIOS always reserves addresses F000h to FFFFh This is the first set of addresses the CPU reads on start up
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara The BIOS Accessed through the address bus Programs stored on ROM chips are know as firmware Programs stored on erasable media are know as software In the original 8088, 384K of the 1,024K memory address were set aside for ROM
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara BIOS Sources The BIOS gets information from three different sources Motherboard ROM Adapter card ROM Loaded from disk media In modern systems the ROM chip on the motherboard is only used to get the system booted, or running
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara The BIOS ROM Chip Resides on the motherboard Usually comes in D ual I nline P in P ackage Almost always has a shiny label indicating the manufacturer and creation date Has a capacity of 65,536 bytes (64KB)
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara The BIOS Program The programs stored on the BIOS chip allow the computer to communicate with basic hardware This hardware includes: Keyboard Floppy drive Hard drive Monitor RAM Serial and parallel ports Other basic devices
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Algonquin College CST8174 Thursday, May 7, 2009 Matthew O’ Meara ROM Versus RAM A ROM chip can store programs like a
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This note was uploaded on 04/17/2008 for the course CST CST8174 taught by Professor Matthewo'meara during the Winter '08 term at Algonquin College.

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CST8174_Lecture_15_Introduction_BIOS - Algonquin College...

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