SETFLAG          Optimized OR                                       Extension

    Optimized form of the OR instruction that sets bits with shortest
    possible instruction. Use only if the resulting contents of the flags
    register is unimportant.

    Example:    RECORD state  zone:4, chg:1, ins:1=1, bak:1=0, onoff:1
                ;...
                setflag [ed_state],MASK chg