We are not sure about the compatibility of the vision command system and 1.0 rcx. Since vision command was created a while back it is most likely compatible with 1.0 Note, however, that to our knowledge they are no longer distributing that system and you will have to pick it up as a second hand sale (perhaps on ebay). Or you can just use a regular camera and a PC (yes, we realize that is it a much more involved process)
might be of some help.
The other alternative is to try the newer system color sensor created by HiTechnic.