DEC VT30-H info

[shadoooo]

Hello Henk,
thanks for the link.
It talk about two boards (one hex and one quad). In effect mine are hex 
and quad.
But the hex board has three IDC connectors, while the quad only two.
My suspect is that the third connector could go to some other module.
Do you have the VT30-H system too?
Could we compare the boards?

About documentation: I can't find the Option Bulletin cited on the text.

Thanks
Andrea