This version of the CHARSET option applies only to consecutive files using record I/O. It gives the user the capability of using EBCDIC data files as input files, and specifying the character set of output files.
.-ASIS---. >>-CHARSET--(-+-EBCDIC-+-)------------------------------------->< '-ASCII--'
Choose a suboption of CHARSET based on what form the file has (input) or what form you want the file have (output).
CHARSET(ASIS) is the default.