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

    Purpose:        Convert an unsigned integer to a wider unsigned
                    integer (move zeroed)
    Format:         opcode src.rx,dst.wy
    Operation:      dst = ZEXT (src)
    C. Codes:       N = 0, Z = {dst EQL 0}, V = 0, C = C
    Exceptions:     None
    Opcodes:        9B    MOVZBW   Move zero-extended byte to word
                    9A    MOVZBL   Move zero-extended byte to long
                    3C    MOVZWL   Move zero-extended word to long
    Description:    For MOVZBW, bits 7:0 of dst are replaced by src,
                    bits 15:8 are zeroed. For MOVZBL, bits 7:0 of
                    dst are replaced by src, bits 31:8 are zeroed.
                    For MOVZWL, bits 15:0 of dst are replaced by src,
                    bits 31:16 are zeroed.