You can set the value stored in unused ROM locations with the #pragma option fillrom statement:

#pragma option fillrom value;

where value is an 8-bit integer expression.

The default integer size of Code Development Systems is 8 bits. If the symbol __INT16 is defined, it indicates that the default integer size is 16 bits.

The __INT16 preprocessor symbol is defined by the compiler when either the +i is set on the command line, or the #pragma option +h directive appears in a source file.