Referring to my ProDOS 8 Technical Reference manual, a MLI error code $56 is described as: $56 - Bad buffer address. The data_buffer or io_buffer specified conflicts with memory currently in use by the MLI. I'm not a guru with ProDOS (only DOS 3.3), so I can't really tell you what it means. Hope this little bit of info helps. Art... netcoking@aol.com