Data Representation (paper 1)
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what is the order for the memory size
bit nibble byte kibibyte mebibyte gibibyte tebibyte pebibyte Bob Nibbled Bens Keish Made Gratefully To Paul
How many bits is in a byte
8
how many bits are in a nibble
4 bits (half a byte)
how many bytes are in a kibibyte
1024
how many bytes are in a mebibyte
1024 x 1024
how many bytes in a gibibyte
1024 x 1024 x 1024
how many bytes in a tebibyte
1024 x 1024 x 1024 x 1024
how do you work out how many mebibytes are in a value
divide it by 1024 x 1024
what is denary
the 10 number base number system (0-9)
what is binary
the 2 number base number system using the digits 0 and 1 and place values 1, 2, 4, 8, 16…
why do we use binary to represent data in computers
becuase anything further would make the data hard to deal with and possibly cause error, it is simpler being one of two values
what is one of the benefits of binary
takes up less storage so it makes computers cheaper and more reliable
what is hexadecimal
the base 16 number system that uses the values 0-9 and A-F
how do you convert a denery number to binary
divide it by 2 and take the answer or remainer and repeat with the answer
Which bit is most significant in binary
the biggest
what does CPU stand for
central processing unit
what does a CPU do
store data in registers
why do overflow errors occur when adding binary
because if the result is greater than 255 then another bit is needed
what makes hexadecimal to binary easier
each value cna be taken into 4 binary bits and then just put the bits together
how do you convert denary to hexadecimal
divide the denary by 16 and then take the remainder and divide the result again
what is a sign bit
when all the other bits of the binary are negative
what is two’s complement
when only the MSB is the negative placeholder
how do you convert nagtive denary numbers into binary using two’s complement
• write the binary as normal • change the 0 to 1 and 1 to 0 • then add one
What is the affect when binary shifts left
you multiply but the powers of 2