VMS Help MACRO, VAX MACRO Assembler, Instructions, MOVTC  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Purpose:        to move and translate a character string
    Format:         opcode srclen.rw,srcaddr.ab,fill.rb,tbladdr.ab,
                           dstlen.rw,dstaddr.ab
    C. Codes:       N = {srclen LSS dstlen}, Z = {srclen EQL dstlen},
                    V = 0, C = {srclen LSSU dstlen}
    Exceptions:     None
    Opcode:         2E    MOVTC    Move translated characters
    Description:    The source operand string specified by srclen and
                    srcaddr is translated and replaces the destination
                    string as specified by dstlen and dstaddr.
                    Translation is done by using each byte of src as an
                    index into tbl (a 256 byte array). The selected byte
                    is placed in dst. If the dst is longer than src, dst
                    is filled using fill. If dst is shorter than src,
                    the highest bytes of src are not moved. dst and src
                    may overlap with no ill effects -- but if dst
                    overlaps tbl the result is unpredictable.
    Notes:          After execution:

                    R0 = number of untranslated bytes remaining in the
                         source string; R0 is nonzero only if source
                         string is longer than destination string
                    R1 = address of one byte beyond the last byte in
                         source string that was translated
                    R2 = 0
                    R3 = address of the translation table
                    R4 = 0
                    R5 = address of one byte beyond the destination string