Paper 2 Flashcards
Peer to Peer
Each computer has equal status
- can act as both a client and a server
Resources stored on or shared from any computer
No centralised management of security
- security can be managed individually on a computer
Same resources can be made available or shared from multiple computers
Hardware and software on computers are general purpose
Parallel Data Transmission
Multiple bits transferred simultaneously
Each simultaneous bit send down a different wire
Advantage of Serial Transmission rather than Parrallel
Hardware required is cheaper
Serial Transmission does not suffer from cross talk
Does not suffer from data skewing
Purpose of Start bit
Start receiver clock ticking
Synchronise clock in receiver to the transmitting one
Purpose of Stop bit
Provides time for receiver to process the recieved data
Allows for next start bit to be recognised
System Software
Software used in the management of a computer system
Software that provides a platform for other software to use
Functions of an OS
Hide Complexities from the user
Handle interrupts - calls interrupt handler
Allocate processes - decide which processes to carry out when
Allocate memory/ RAM to processes - only allow for writing to allocated memory
Allocate I/O devices to processes
Manage power consumption
Floating Point Numbers- why normalised form ?
Maximise Precision in a given number of bits
Unique representation of each value
Absolute Error
Actual Error - Closest Représentable
Relative Error
(Absolute Error / Closest Representable) X100
Why assembly language over high level
Execute quicker
Less memory once translated
Programmer have complete control over machine code once translated
RFID
Tag contain transmission circuitry and data
Memory on tag to store data
RFID reader transmits / sends signal
Signal activates / induces current in RFID tag
Tag transmits via Radio wave
Reader converts wave into binary
Relationship between Assembky language instruction and machine code instruction
1 to 1 mapping
Assembly language instruction translates into machine code instruction
Advantage of using MIDI
more compact representation
Easy to modify
Simple methods to compose algorithmetically
Musical score can be generated directly from MIDI file
No data lost through sampling
Client Server
1 or more computers nominated as server
Client access resources from server
- resources stored on server
Centralised management of security
- must login
Resources cannot be accessed if server turned off
Hardware and Software can be optimised for providing services
