Chapter 3
At the lowest level, a computer is an electronic machine. The
presence
of a voltage is “1” and
absence
of a voltage is “0”.
The basic unit of information is the
binary
digit
, or
bit
.
A collection of
n
bits has
2
n
possible states.
A
digital
system has a finite number of symbols.
NOT A( NOR) NOT B is = to what?
A NAND B = to what?
Any information can be represented in binary.
•
EBCDIC
stands for
Extended
Binary Coded Decimal Interchange Code
. This is a standard for representing alphanumeric
text. This is a standard associated with IBM computers. Assigns
8
bits per character and is an extension of binary coded
decimal (BCD)
•
Unicode
can represent at least 65,000 many unique characters
•
The Extended ASCII standard assigns how many bits for each alphanumeric character?
8
•
The simple ASCII standard assigns how many bits for each alphanumeric character?
7
•
An 8bit code can represent how many unique characters?
256
•
All text can be translated into binary code.
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 Spring '10
 K
 Binary numeral system, ASCII, Binary Coded Decimal

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