more expensive, with a “cadillac” model like the CP-100 Computer Patch interface listing for $329.95.
Software to translate the Baudot code used in RTTY into digital code that computers understand is available free or at low cost
(check ham radio-oriented magazines and computer BBSes for leads). The maker of the CP-100 offers a nice Commodore program called SWL TEXT for $99.95; able to read the Cyrillic as well as the Roman alphabet, it comes with ROM cartridge, cable, keyboard overlays and manual.
For a lively, informative, but not-very-technical overview of RTTY as transformed by modern electronics, get RTTY Today by Dave