The KX3 display showing direct copy of digital modes.  This one was a PSK31 QSO scrolling by.

It is possible to send and receive the digital modes, RTTY, PSK31, and CW with the built in decoder.  For transmit you can use the attached CW paddles for all modes.  In RTTY, and PSK, you send with the paddles also. When transmitting, you hear the CW side tone and the RTTY or PSK tones together.  It makes it possible to use these modes in the field with nothing except the rig, it's internal batteries and tuner, and some wire.  No computer needed!!