Flashcards
Revision Flash Cards
Cards in this deck (15)
- 1Describe a basic computer system.
- 2What is the role of the CPU?To fetch, decode and execute commands.
- 3What is the base number of binary logic?8
- 4What is 0001 1101 in denary?29
- 5What is the base number in hexadecimal?16
- 6What is 5C in denary?92
- 7What does ASCII stand for?American Standard Code for Information Interchange.
- 8What uses ASCII?PCs
- 9What is the base number of ASCII?7
- 10How does ASCII represent text in a computer system?Each character is given a code that is stored in binary.
1 byte = 1 character
Characters coded include letters, digits, punctuation and control characters such as tab and enter. - 11What is the difference between ASCII and Unicode?ASCII uses either 7 or 8 bits to store code; this means it can store a maximum of 256 characters.
Unicode uses 16 bits to store characters and so can store many more characters (65,536). - 12What is an Input Device?A device that can be used to insert data into a computer system.
- 13What is an Output Device?A device connected to a computer that takes information from the computer and gives it out as an analogue signal - as an image, sound, etc.
- 14What is RAM?Random Access Memory that temporarily stores data. This form of storage is volatile that means when the power is switched off, the data is not saved.
- 15What is ROM?Read Only Memory. This is memory that cannot be changed is is non-volatile. It contains the boot-up code that is needed for when the computer restarts.