Decimal | Hex | Value
========+=====+================
    0   |  00 | Null
    5   |  05 | Tab
    7   |  07 | Delete
--------+-----+----------------
   13   |  0D | Carriage Return
   22   |  16 | Backspace
   24   |  18 | Cancel
--------+-----+----------------
   37   |  25 | Line Feed
   39   |  27 | Escape
   47   |  2F | Bell
--------+-----+----------------
   64   |  40 | Space
                                                                                 
================================================================================

To convert ASCII to EBCDIC (ascii to ebcdic) or vice-versa.
   dd if=ascii.file  of=ebcdic.file conv=ebcdic
or dd if=ebcdic.file of=ascii.file  conv=ascii

For example, this is the command to read the header from a DLT tape, which is
evidently always written in ASCII, even on an AIX system.
  dd if=/dev/rmt2 bs=156k count=1 conv=ascii
returns 80 characters, the constant character string "VOL1" followed by the
6-character label (000166 in this example), followed by 70 blanks.

================================================================================

               E B C D I C                     A S C I I
               ===========                     =========
         Hex |0123 4567 89AB CDEF       Hex |0123 4567 89AB CDEF
         ====+==== ==== ==== ====       ====+==== ==== ==== ====
           0 |                            0 |
           1 |                            1 |
           2 |                            2 | !"# $%&' ()*+ ,-./
           3 |                            3 |0123 4567 89:; <=>?
           4 |             . <(+|         4 |@ABC DEFG HIJK LMNO
           5 |&           !$ *);^         5 |PQRS TUVW XYZ[ \]^_
           6 |-/           , %_>?         6 |`abc defg hijk lmno
           7 |           ` # @' "         7 |pqrs tuvw xyz{ |}~
           8 | abc defg hi       
           9 | jkl mnop qr       
           A |~ st uvwx yz    [  
           B |                ] 
           C |{ABC DEFG HI       
           D |}JKL MNOP QR       
           E |\ ST UVWX YZ       
           F |0123 4567 89:    =