82163B HPIL Video interface

[rhs]

Hi, I' trying to connect my HP71 with a 82163B HPIL Video interface, the interface works quite well and is showing a flashing cursor on the monitor, however, I cannot get any little character from the HP71 onto the display of the monitor. In the manual I find some commands for the use with the HP41, isn't there any possibility to use the video interface with the HP71?
Any help is very much appreciated, rhs