TyroCity: Computer 12 Notes

Daisywheel Printer

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

It is an impact type character printer. It can only print text of fixed size and font. It contains separate hammer for each character so it is also known as letter quality printer. Its printing quality is better than dot matrix printer. It is faster than dot matrix printer. It is rarely used at present.

Merits:

Its printing quality is better than dot matrix printer.
It is faster than dot matrix printer.
It can print multiple copies at the same time using carbon paper.

De-merits:

It can print text of fixed size and font.
It is noisy, slower than non-impact printers.
It has low printing quality than non-impact printers.
It can print a single color.
It is not appropriate for large volume printing.
It can’t print images.

Computer XII

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

General terms

Dot Matrix Printer

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

It is an impact type character printer. It prints character by the combination of dots where each dot is printed when the hammer strikes the printing material. It can print both image and text of different font and size. It is appropriate for low volume printing. It is usually available in three operating modes: fast, medium and slow. Faster speed will have low printing quality.

Merits:

It can print both image and text of different font and size.
Its operating cost is low.
It can print multiple copies at the same time using carbon paper.

Demerits:

It is noisy, slower.
It has low printing quality.
It can print single color only.
It is not appropriate for large volume printing.

Modem

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

It is derived from the term modulator and demodulator. It is used for connecting networks (mainly internal) through the traditional telephone system. It can convert analog data transmitted through the cable into digital required from the computer and vice versa.

Line Printer

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

It is an impact type printer. It can print a complete line of text at a time. It can’t print images and text of different size and font. It is expensive than non-impact. It is appropriate for continuous printing like printing mark sheet, bill, bank statement, etc. the different line printers are: chain printer, drum printer, band printer.

Merits:

It can be used for continuous printing.
It is faster than character printer.
It can print a complete line of text at a time.
It can print multiple copies at a time.

Demerits:

It can’t print images and text of different size and font.
Its printing quality is low.
It is slower and noisy.
It can print a single color.
It is expensive.

Laser Printer

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

It is non-impact type page printer. It uses powder ink (toner) for printing. It is expensive to buy but its operating cost is low. So, it is appropriate for large volume printing. Multi-colored laser printer is larger in size and they are slower and expensive. It can print about 30 pages per minute.

Merits:

It is not noisy and is faster than impact printer.
It can be both single and multi-colored.
Its operating cost is low.
It can print both text and images.
Its printing quality is better than impact printer.

Demerits:

It is expensive to buy.
It can’t print multiple copies at the same time.
It is not appropriate for continuous printing.

Ink Jet Printer

Computer 12 Notes — Sun, 08 Apr 2012 05:41:42 +0000

It is non impact type character printer. It uses liquid ink for printing. It can be single or multi-colored. Multi-colored ink jet printer can use either RGB colors or CYMK (cyan, yellow, magenta, black). This printer uses dot-matrix approach for printing i.e. a dot is formed by spraying liquid ink. Series of dots are used to print characters and images. It is cheaper to buy but its operating cost is expensive due to expensive ink. So, it is appropriate only for low volume printing.

Merits:

It is not noisy and is faster than impact printers.
It can be both single and multi-colored.
It is cheaper to buy.
It can print both text and images.
Its printing quality is better than impact printers.

De-merits:

Its operating cost is high.
It is appropriate for low volume printing only.
It can’t produce multiple copies at the same time.
It is not appropriate for continuous printing .