Section 10,33: Z

 Zw[.m] (Hexadecimal Editing)

 On input, Z transfers "w" characters from the external field and
 assigns them, as a hexadecimal value, to the corresponding I/O list
 element (which can be any data type).  The input value must be in
 the form of a hexadecimal constant.  Each input character
 corresponds to four bits in the variable, high order to low order.
 If the input value contains more characters than specified by "w",
 an error occurs.  If the input value contains fewer characters, it
 is padded with zeros on the left before being converted.

 On output, Z transfers the number of hexadecimal characters
 specified by "w" from a variable or constant to the record.  The
 rightmost characters represent the low-order bits.  If the variable
 or constant contains more characters than "w" specifies, the value
 is set to all asterisks (an error occurs).  If the variable or
 constant contains fewer characters, the value is padded on the left
 with spaces.  "m" specifies the minimum number of characters (with
 zero padding) that the value can contain.  "m" must be an integer
 in the range 1 through 255.  "w" must be large enough to include a
 possible minus sign.  If "m" is present, the external field
 consists of at least "m" digits and, if necessary, is zero filled
 on the left.