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Computer keyboard

Computer keyboard is the set of typewriter-like keys
that enables you to enter data into a computer.
Computer keyboards are similar to electric-typewriter
keyboards but contain additional keys. The keys on
computer keyboards are often classified as follows:
alphanumeric keys — letters and numbers
punctuation keys — comma, period, semicolon, and
so on.
special keys — function keys, control keys, arrow
keys, Caps Lock key, and so on.

The standard layout of letters, numbers, and punctuation is called QWERTY
keyboard because the first six keys on the top row of letters spell QWERTY. The
QWERTY keyboard was designed in the 1800s for mechanical typewriters.
There is no standard computer keyboard, although many manufacturers imitate the
keyboards of PCs. There are actually three different PC keyboards: the original PC
keyboard, with 84 keys; the AT keyboard, also
With 84 keys; and the enhanced keyboard, with 101 keys. The three differ
somewhat in the placement of function keys, the
Control key, the Return key, and the Shift keys.
In addition to these keys, IBM keyboards contain
the following keys: Page Up, Page Down, Home,
End, Insert, Pause, Num Lock, Scroll Lock, Break,
Caps Lock, Print Screen.
What is a Hard Disk Drive (HDD)?

Hard disk drive is the mechanism that reads and writes data on a hard disk. Hard
disk drive has many inflexible platters (discs) coated with magnetic material.
Read/write heads can record computer data on these discs. Atypical hard disk
rotates at 3,600 revolutions per minute, and the read/ write heads ride over the
surface of the disk on a cushion of air 25 micron deep. Hard disk drives (HDDs)
for PCs generally have seek times of about 12 milliseconds or less. Hard disk
drives are sometimes called Winchester drives. Winchester is the name of one of
the first popular harddisk drive technologies developed by IBM

Questions:
1. How are the keys on computer keyboards classified?
2. How is the standard layout of keys on a keyboard called?
3. How many keys has enhanced keyboard?

4. How are hard disk drives sometimes called?
5. What is hard disk drive?

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ZABENOK123
ZABENOK123
4,6(48 оценок)
They are teached english at school. i hope my mistake will be forgiven. all documents were lost by kate. jane was operated last month by professor. i was told that the would leave soon. my purse was forgotten at home by me. i will be taken to the country by my parents. this work will be finished in the evening.

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