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

    Purpose:        Bit set - perform logical inclusive OR of two
                    integers
    Format:         opcode mask.rx,dst.mx                  ;2 operand
                    opcode mask.rx,src.rx,dst.rx           ;3 operand
    Operation:      dst = dst OR mask                      ;2 operand
                    dst = src OR mask                      ;3 operand
    C. Codes:       N = {dst LSS 0}, Z = {dst EQL 0}, V = 0, C = C
    Exceptions:     None
    Opcodes:        88    BISB2    Bit set byte, 2 operand
                    89    BISB3    Bit set byte, 3 operand
                    A8    BISW2    Bit set word, 2 operand
                    A9    BISW3    Bit set word, 3 operand
                    C8    BISL2    Bit set long, 2 operand
                    C9    BISL3    Bit set long, 3 operand
    Description:    In 2 operand format, dst is ORed with mask and dst
                    is replaced by the result. In 3 operand format, src
                    is ORed with mask and dst is replaced by the result.