Fonts can be specified, using the CHARS parameter, in the JCL of the job that produces the output. The CHARS parameter can appear in the DD or OUTPUT statement. When using this method, the following restriction must be considered: The CHARS JCL parameter is limited to four characters, but the font name may be up to six characters (in the case of Typographic Fonts).
Fonts can be specified, using dynamic allocation (SVC99), in the application program that produces the output.
Fonts can be specified in a PAGEDEF definition (up to 6 characters).
If a font is not specified in any of the above, the default font specified in the PSF procedure is used. (If a CHARS subparameter is specified in the DEVICE initialization statement of JES3, then the PSF definitions are overridden.)