Functions of Interfaces!

Buffy Does Crack!!

Buffering! - temporary storage of Data


D (DtoA!, AtoD!) - Data Conversion
Digital to Analogue, Analogue to Digital

C - Compensating for differences in speed of processor and peripherals!

Different features of Comparison

PPM (Pages Per Minute) Speed, DPI (Dots Per Inch, Resolution, Print Quality) Price, Speed of Data Transfer, Clock Speed

Inkjet V Laser
Laser are generally faster (higher PPM)
Inkjet usually better quality prints
Inkjet sprays ink onto page, Laser uses toner and an actual laser!
Inkjet is noiser! Laser prints come out warm because of heater to dry the toner!

Backing Storage Devices in size order
Floppy Disk
CD-ROM
Flash Drive
USB Pen Drive
DVD-ROM
Magnetic Tape
Hard Drive

Monitor Types
CRT - Cathode Ray Tube
LCD - :Liquid Crystal Display
TFT - Thin Film Transistor

Types of Access

Sequential

Must go through the memory locations in order to get to the one required



Direct/Random

Can access at any point (can skip directly to ANY memory location required)

5 box diagram

The Processor

C U A Love U Right!

CU - Control Unit
makes sure instructions are carried out in the right order

ALU - Arithmetic Logic Unit
carries out all calculations and makes logical decisions

R - Registers
temporary memory locations

Main Memory
RAM - Random Access Memory - TEMPORARY
ROM - Read Only Memory - PERMANENT

Input Devices
mouse, keyboard, mic, camera, webcam, scanner

Output Devices
monitor, speakers, printer, projector,

Backing Storage
USB Pen, Hard Disk, Floppy Disk, CDr,rw,rom, DVDr,rw,rom External Hard drives, Memory Cards