Konica Minolta TC-X - Manual (Page 11)

(6) Turn the film advance lever (1) as far as it turns and
press the shutter release button
(7). Repeat until the number " I " appears in the frame
counter (26).
*When the film is advancing properly, the film rewind
knob will turn counterclockwise.
*Film should be loaded or unloaded in the shade or
indoors, avoiding direct sunlight.
4.butkus.org
*The film check window is for use with DX type film, and
lets the user check the kind of film, film speed, and
number of frames exposed, while the film is in the
camera.
6. Automatic exposure system (AE)