As every kid who has ever punched 80085 into their calculator can attest, it obviously can be used for some amount of text. In fact it can clealry do AbcCdeEFghHiJLnoPqrtuUy. If you're willing to accept that numbers can almost always be told apart from letters by context rather than by glyph, it can also do BGOSZ. https://fontlibrary.org/en/font/segment7