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Unformatted text preview: keys that enable rapid processing of
sales transactions as well as alphanumeric input. For instance, instead of typing the name
and price of a purchased item, say Veg. Pizza, the operator need only press the key
labeled "Veg. Pizza" and the system automatically prints the name and price of the item
from an internally stored database. This application requires a special-purpose keyboard
for rapid data entry and faster operation. Similarly, an ATM (Automatic Teller Machine)
used in banks for financial transactions by customers needs a simple keyboard with only
a few keys for the purpose. There are many such applications that may have the benefit of
rapid data entry and faster operation by the use of special-purpose keyboards that are
custom-designed for a special type oi application. Keyboards specially designed and used
for a specific type of application are called special-purpose keyboards.
Other Related Concepts
Some other concepts related to keyboards are discussed below.
Foreign Language Keyboards
Several countries, which do not use English alphabets in their local languages, have
designed special keyboards for data entry in their local languages. Some of these
keyboards have a large number of keys and use a coding scheme with more bits to
accommodate the large number of characters used in the language. For example, the coding scheme used for the QWERTY keyboards works with an 8-bit code, which can
accommodate 2 = 25€ different characters. However, Japanese language keyboards work
with a 16-bit coding scheme to accommodate all the characters used in Japanese
We saw in the discussion above that the exact function assigned to the function keys Fl to
F12 and to some of the special function keys depends on the software being used. That is,
different software packages program the same keys to perform different functions. If a
user uses different types of software, it becomes difficult for him/her tc remember the
functions assigned to different keys for different software. Hence several software
vendors distribute their software packages with keyboard templates that designate which
commands are assigned to which...
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This document was uploaded on 04/07/2014.
- Spring '14