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These printers print characters by using magnetic recording techniques. This technique allows the printer to write on a drum surface. This surface then passed through magnetic powder. The plotters are used for creationg high quality drawings, aps, charts, graphics and diagrams. They draw high quality colour graphics using ink-pen. They can use either single-colour or multicolour pens. They are generally used for printing results of applications like CAD. They are more expensive than printers. Plotters can be classified as-
Drum plotters
Micrographic plotters
flat-bed plotters
Inkjet plotters
A voice response system provides sound as an output. A good example of voice response system is a telephone answering machine connected to a computer.
The process of loading and starting up the disk operating system is called booting. The term booting descends from "bootstrop" as in the expression "pulling yourself up by the bootstrops" and refers to the sequence your computer goes through to load and start up DOS. Once the system is booted, DOS is in control of your computer system and handles everything your enter.
The input / output system as the name implies handles every that comes in (input) and goes out (output) of the computer system.