Fun fact: One of the reasons for the electronic typewriters and typewriter addons of the '70s and '80s was that computer personnel had higher wages than mere typists. As long as it connected to a typewriter, the operator got paid as a typist. Hence mongrels like the Olivetti ETV 300
The last link has great photos of the complete machine - I only have a set of boards from the computer box.
While the setup is not complete without a dump from an Olivetti typewriter (ET 111, 112, 115, 116, 121, 201, 221 or 225) and its serial LCU (line communication unit) that is the ETV 300's keyboard and printer, the ETV 300 is a self contained CP/M machine with one or two 5,25" floppy drives.
I have the ROM dumps from my boards and some software from user 1ST1 from the German VzekC forum (FTP and here