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Numbers & Characters

Please Note: All info is from memory, approximate and subject to correction

Time

     Jiffy               .01 sec
     Millisecond    ms   .001 sec
     Microsecond    us   .000001 sec
     Nanosecond     ns   .000000001 sec
     Picosecond     ps   .000000000001 sec
     hornosecond    hs   time from light changing to green till the guy behind you blows horn

Quantity
     K = Kilo = 1,000
     M=Meg= 1,000,000           or 1000 K
     G=Gig= 1,000,000,000       or 1000 M
     T=Terra= 1,000,000,000,000 or 1000 G

Digital Numbering systems
     Binary = 1bit (0-1)          0   1
     Octal number = 3 bits(0-7) 000 001 010 011 100 101 110 111
                                 0   1   2   3   4   5   6   7
     Bi-Quinary and Qui-Binary ( 2 of 7 bits) 00 00000  or  00000 00
     Hexadecimal-4 bits (1-F) 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
                                0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F

          Nibble      =  2 bits (0-3)            00
          Digit       =  4 Bits (0-F)          0000
          Byte        =  8 bits (00-FF)        0000 0000
          1/2 Word    =  2 Bytes  = 16 bits    0000 0000 0000 0000
          Big Mac     =  3 Bites (App.)        Just checking ;-))
          Word        =  4 Bytes  = 32 bits    0000 0000 0000 0000 0000 0000 0000 0000
          Double Word =  8 Bytes  = 64 bits
          Quad Word   =  16 Bytes = 128 bits

Character and digit representation
     Hollerith=punched card code
     BCD=Binary Coded Decimal
     EBCD=Extended Binary Coded Decimal
     EBCDIC=Extended Binary Coded Decimal Interchange Code
     ASCII = American Standard Interchange Character Interchange 
     7-trk = 7 track magnetic tape
     9-trk = 9 track magnetic tape

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