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

    Purpose:        Perform extended-precision multiplication
    Format:         opcode mulr.rl,muld.rl,add.rl,prod.wq
    Operation:      prod = {{muld * mulr} + SEXT (add)}
    C. Codes:       N = {prod LSS 0}, Z = {prod EQL 0}, V = 0, C = 0
    Exceptions:     None
    Opcode:         7A    EMUL     Extended multiply
    Description:    mulr is multiplied by muld to give a double length

                    is then stored in prod.