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

    Purpose:        Bit clear PSW - clear trap enables
    Format:         opcode mask.rw
    Operation:      PSW = {PSW AND {NOT mask}}
    C. Codes:       N = N AND {NOT mask<3>}; Z = Z AND {NOT mask<2>}
                    V = V AND {NOT mask<1>}; C = C AND {NOT mask<0>}
    Exceptions:     Reserved operand
    Opcode:         B8    BICPSW   Bit clear PSW
    Description:    The PSW is ANDed with the complement of mask and PSW
                    is replaced by the result.