1.2 Memory & Storage - Units of Memory, Slides of Computer science

Download 1.2 Memory & Storage - Units of Memory and more Slides Computer science in PDF only on Docsity! • What are they? • What data do they hold? • What are their differences? Starter: RAM & ROM 1 1.1: System architecture The CPU 1.2 Memory & storage Units of memory • Understand the units of memory available in computers today • Explain the key characteristics of different types of RAM & ROM Virtual memory 1.2: Memory & storage Units of memory Bit The smallest unit of data that can be stored by a computer. Each 'bit' is represented as a binary number, either 1 (true) or 0 (false). Byte A 'byte' contains 8 bits, Example: T could be stored as 11101001 Virtual memory 1.2: Memory & storage Units of memory Kilobyte (KB) Made up of 1024 bytes. Megabyte (MB) Made up of 1024KB Gigabyte (GB) Made up of 1024MB Terabyte (TB) Made up of 1024GB What comes after Terabyte (TB)? What is it made up of? Virtual memory 1.2: Memory & storage Computers today Typical computers might have the following RAM: • Raspberry Pi: 512 MB (0.5 GB) • smartphone: 1 GB • laptop: 16 GB • games console: 8 GB • Each unique memory location in RAM holds one word of information. • Every memory location has a unique address so that once data has been stored there it can be found again later when it's needed. An introduction to ROM & RAM 1.2: Memory Task • A single letter or character would use one byte of memory (8 bits) • How many bytes would you need for your name? • How many bits would you need for your name • How many bytes would you need for your form? An introduction to ROM & RAM 1.2: Memory ASCII • Every letter in the alphabet is represented by a byte (8 digits of 1’s and 0’s). • This table stores the codes for each character. • Can you write your name in binary? Virtual memory 1.2: Memory & storage Word size…? • What is word size? • What does word size measure? Virtual memory 1.2: Memory & storage Task 1: Types of RAM Dynamic RAM (DRAM) Static RAM (SRAM) Describe the key characteristics of Dynamic & static RAM Virtual memory 1.2: Memory & storage Types of ROM…? • What are the 2 types of ROM? • How do they compare? Virtual memory 1.2: Memory & storage Task 2: Types of ROM Programmable read only memory(PROM) Electrically-erasable programmable read only memory (EEPROM) Describe the key characteristics of PROM & EEPROM