VTech Write It Right Computer Specifikace Strana 32

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Storing Files on a Computer
To learn more about how your computer works, you have to
learn how MS-DOS organizes and stores data.
All
information on disks is stored in
fi1es.
A
fIle
is
simply a
collection of information. Computer
fIles
can be broken down
into three categories:
System Files ... contain MS-DOS information that man-
ages the computer operations.
Program Files... contain information that lets your
computer perform a series of specific tasks.
Data Files... contain information which you enter, such
as
documents created in a word processing package, or
worksheets created with a spreadsheet package (like Lotus
1-2-3).
All
fIles
are referred to by their filename. MS-DOS fIlenames
may not be more than eight characters long. Filenames can
contain letters, numbers, and the symbols
$ & # % ' ( ) -
@ A { } or
!.
To further identify a
file,
a fIlename can contain an extension
of up to three characters. The extension
always
appears at the
end of the of a filename, preceded
by
a period. Extensions are
a good
way
to categorize
fIles
into efficient groupings. For
example,
fIles
containing Lotus spreadsheets end in the extension
.WKS
- an abbreviation for worksheet, while word processing
documents could end in .DOC - an abbreviation for document.
The following are all valid MS-DOS filenames:
SALESLTR.DOC Checking.bal File#1.TXT
QTR1.WKS
MyFile
WlN.INI
Menu.BAS Work.TST
XXX.xxx
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