Even 5-bit Baudot-type codes were not standardized. A-Z and 0-9 are the same on all Teletype machines, but there's (at least) ITA2, USTTY, Fractions (⅛,¼,⅜,½,⅝,¾,⅞ only, for stock market use) and Weather Symbols (8 direction arrows and 4 cloud cover symbols). I own five Teletype machines and only two of them are 100% compatible.