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

    Purpose:        Transfer control (branch)
    Format:         opcode displ.bx
    Operation:      PC = PC + SEXT (displ)
    C. Codes:       Not affected
    Exceptions:     None
    Opcodes:        11    BRB      Branch with byte displacement
                    31    BRW      Branch with word displacement