The best place I've found for information on remotes and codes is http://remotecentral.com.
I did a quick look and information for the Sony RM-VL900 universal remote says it is preprogrammed with information for Nakamichi cassette decks. I've got a Sony RM-VL700 that is a great, inexpensive universal remote so I suspect the 900 would be similar.
I did a quick look and information for the Sony RM-VL900 universal remote says it is preprogrammed with information for Nakamichi cassette decks. I've got a Sony RM-VL700 that is a great, inexpensive universal remote so I suspect the 900 would be similar.