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Unformatted text preview: to I/O capabilities. It has local data editing capability and the ability to
consolidate input data prior to sending them to the CPU of the main computer. This
means that preliminary processing of input data can take place locally and that the data
can be cleaned up at the terminal itself before it is transmitted to the main computer for
processing this can lead to tremendous saving of clean data preparation time as compared
to dumb terminals. However, smart terminals cannot be programmed by users.
An intelligent terminal is a small computer by itself. It consists of a built-in
microcomputer that can be programmed by users. These programmable terminals have
extensive local data processing power. Large working files can be maintained locally and
small data processing jobs can be handled by the terminal itself without the need to
interact with the CPU of the main computer. They have their own on-line secondary
storage devices like disk, which are used during the processing of these small jobs.
Programmed error-detection tests can also be stored in the terminal for the validation of
input data which can ensure the transmission of clean data to the main computer system
for further processing.
With the fast reduction in the cost of microcomputer components and disk storage, most
terminals of today are intelligent or at least smart to help make data entry and retrieval
easier for the users.
An X terminal is a graphics terminal that has a rich set of commands for the following:
1. To display characters.
2. To move the cursor position. 3. To draw graphics and images such as draw a line of desired thickness and color,
draw an empty circle or a circle filled with a certain color, draw a bitmap, draw text, etc.
4. To manage areas on the screen (called windows) such as open a new window of the
desired size, close an existing window, resize an existing window, etc.
X terminals are very common these days.
Today computers are hardly used in stand-alone mode. They are often connected to
networks and communicate with other computers on the network. In this t...
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- Spring '14