Giáo trình tổng hợp các cách sử dụng máy in laser một cách hiệu quả và tiết kiệm phần 4 potx

 Rereen normally required if errors are encountered.

 Data is not current.

 Error correction is more difficult.

Question 2. Online Processing System?

- Def: Inputs data enters the computer directly as soon as it is being

transacted. There information will be processed immediately and updated

into the master file.

- Ads:

 Enter availability of information for decision making.

 More accurate data capture.

 Schedules suits user.

- Dis:

 CPU time is used less efficiently.

 Random arrival of transactions, terminal operator process

each transaction separately.

 More expensive than batch processing.

Question 3. Real Time Processing System?

- Def: One which controls the environment by receiving data processing

them and returning results sufficiently quickly to affect the functioning of

the environment at that time.

- Ads:

 Response time is very critical and sufficient quick.

- Dis:

 Expensive hardware & software.

 Very complex in terms of hardware & software.

Chapter 4: PRINTERS AND TERMINALS.

Question 1. Classification of printers?

1. Classifying printers according to speed.

a. Serial printers

Slow printers that print one character at a time.

Eg: Dot matrix printers

Daisywheel printers

b. Line printers

Medium to high speed printers that can print in excess of 2000 lines per

minute.

Eg: Chain Printers

Band Printers

Drum Printers

2. Calssifying printers according to method of printing

a. Impact printers

Use hammers or prints to strike a print rebbon in order to form the character

on the paper.

b. Non impact printers

Use more silent methods of printing.

Eg: Thermal printers

Ink Jet printers

Lazers printers

3. Classifying printers according to print quality

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