Glossary of Terms
 
  To Host port  
  This type of serial port can be found on many MIDI instruments (in addition to the MIDI jacks) and allows direct connection from the MIDI device to a personal computer without the need for a seperate MIDI interface. The interface cable used is different for a Macintosh computer than a PC. Certain settings must be made on the computer to use the port for MIDI. On a PC, a special serial port driver must also be installed.  
  Source: Yamaha  

Also refered as:
  EIA-232   RS-232   To Host connector   serial port
Related terms:
  Firewire   MIDI   To Host cable   To Host switch   USB   serial port cable   serial port driver