.PO4
.MT1
.PL80
                               HEX
What is HEX code?

      A single digit number that equals a number from 0 - 15 in decimal.

             0 = 0
  DEC        1 = 1        HEX
  Base 10      |          Base 16
             9 = 9
            10 = A  \
            11 = B   |
            12 = C   |--- Since we do not have a decimal number
            13 = D   |      larger than 9 - they pick A - F 
            14 = E   |      for use.
            15 = F  /

---------------------------------------------------------------------------
Why TWO digits in a HEX dump?

      From above - you can see that the largest single HEX digit is 15 DEC.
      So to handle an 8 bit computer byte and ASCII characters, a second 
      digit is added for a max. of 256 DEC.

            0F = 15                     9F = 159
            10 = 16       and           A0 = 160
            11 = 17                     A1 = 161
            ||                          ||
            | \__1 = 1 X  1 =  1        | \__1 =  1 X  1 =   1
             \___1 = 1 X 16 = 16         \___A = 10 X 16 = 160
                             ----                         -----
                              17                           161

      Just remember that the 1st col is the digit times one 
                     and the 2nd  "   "  "    "     "   16
                     and add the two together.

---------------------------------------------------------------------------
What about HEX addresses - they use 4 digits of HEX?

      No problem - 3rd col is the digit times 256
                   4th  "   "  "    "     "   4096

            30BE
            ||||
            ||| \___E = 14 X    1 =    14
            || \____B = 11 X   16 =   176
            | \_____0 =  0 X  256 =     0
             \______3 =  3 X 4096 = 12288
                                   -------
                                    12478

---------------------------------------------------------------------------
Do You need this?

      YES - if you plan to later learn how to program in machine language.

      BASIC understanding - just to patch.
            To patch - it is useful to know roughly where you are and where 
            you want go or look.  Do you need to convert each number to
            decimal? - NO!!!!!!.