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06 - Memory.docx

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Department
Computer Science
Course
COMPSCI 1TA3
Professor
John Nakamura
Semester
Winter

Description
Memory Buzz words • Synchronous – data gets transferred at the same time, based on a clock tick • Asynchronous – data is not transferred at the same time, not based on a clock tick • EEPROM – electronically erasable programmable ROM • Virtual memory – hard drive acts like memory Memory • A temporary holding place for data the CPU is going to manipulate o Since memory is temporary, make backups of what you are working on  (usually backup to your hard drive then a USB) • Memory is usually measured in nanoseconds (10e­9 seconds) o Hard drive milliseconds (10e­3 seconds) • Memory is broken up into 1 byte units, which have a unique address • If there are N bytes of memory, the addresses range from 0 to N­1 • Make sure your operating system can handle all of your memory • E.g. 32 bit OS can handle up to 4 GBs of memory Memory categories • There are two main categories of memory o Non­volatile  Retains data when the computer is shut off  E.g. ROM, flash and EEPROM • ROM (read only memory) o Contains instructions that will tell the computer  what to do after it is turned on
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