Sony produced many different camcorders. In order to service them, they created the "Lines and Innerbus Service Adapter" (LISA) which was a top-slot device for the Psion II which could be connected to the camcorder and change its settings.
See the Devices Gallery for more pictures.
For each family of camcorders there was a separate datapack with software to control the LISA device and change the EVR (Electronic Variable Resistor) settings of the camcorder. Here is a list of all the manuals available on this site: