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

    Purpose:        Convert longword to a packed decimal string
    Format:         opcode src.rl,dstlen.rw,dstaddr.ab
    Operation:      {dst string} = conversion of src
    C. Codes:       N = {{dst string} LSS 0}, V = {decimal overflow},
                    Z = {{dst string} EQL 0}, C = 0
    Exceptions:     Reserved operand, decimal overflow
    Opcode:         F9    CVTLP    Convert long to packed
    Description:    src is converted to a packed decimal string and the
                    destination string operand specified by dstlen and
                    dstaddr is replaced by the result. dst
                    and R0-R3 are unpredictable on a reserved operand
                    abort. Overlapping operands will produce correct
                    results.
    Notes:          After execution:

                    R0 = 0
                    R1 = 0
                    R2 = 0
                    R3 = address of the byte containing the
                         most-significant digit of the destination string