Unit 1.2 - Memory Flashcards Preview

OCR GCSE 2019 COMPUTER SCIENCE > Unit 1.2 - Memory > Flashcards

Flashcards in Unit 1.2 - Memory Deck (7)
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1

Purpose of RAM

Stores
Programs, data, parts of the Operating System
currently in use

2

Purpose of ROM

Stores BIOS
(Basic Input/Output System)


Used to boot up the computer
(Bootstrap Loader)

3

RAM - Features

Random Access Memory

Volatile - Data Lost when power is off.

Contents can change.

Removable /upgrade (GB’s)

4

ROM - Features

Read Only Memory

Non Volatile - Data Not Lost when power is off.

Contents cannot change

Non Removable (MB’s)

5

Virtual Memory

Secondary storage used to act like RAM when RAM is full.

VM slower (Data go back to RAM first)
Disk thrashing Noise (high rate of disk access)
Moving Data uses CPU cycles

6

Flash Memory

Non-volatile storage

Electrically erased and reprogrammed. (EEPROM)

7

Types of - RAM

SRAM - Static
- Faster
- Expensive
- Cache
- Data Stays

DRAM - Dynamic
- Slower
- Cheaper
- RAM Modules
- Data needs to be constantly refreshed
- VRAM uses Video RAM