The R&S Logic Generator IGA seems to be some sort of digital pattern generator (see attached picture, snatched from an eBay listing). However, I can't find much information about it apart from a mention in a german text book "Handbuch Digitaler Schnittstellen". I got the one from the eBay listing as it seemed an interesting topic to investigate.
Does anybody happen to have a user or service manual for this device?