A group of five FORTRAN-callable subroutines is presented. These allow manipulation of bytes of any size (up to 36 bits or a full word), from any location within a source variable to any location within a target variable. A single call moves any number of bytes of a given size; alternatively, repeated calls fetch or store adjacent bytes successively without bookkeeping effort on the part of the user. Code is in MACRO-10 assembly language. Examples are given illustrating the use of the calls. (auth)