The original commodore A2000 genlock. Inserts internall into the A2000 (and compatibles) into the internal video slot. Contains a 23pin monitor connector and two RCA connectors for video in and video out. The difference between the 2300 and 2301 is that one is believed to be NTSC (probably 2300) and other PAL (probably 2301)
Thanks to Frank Cieslewicz