Strange Qbus cards: Data Systems Design and Marconi

Hiyas, One of the results of today's 400mi drive is a box of Qbus cards that once were in custom PDP-11 based systems in use at various locations at Marconi. Most are the usual suspects found in such systems, but there's also a bunch of weird ones: - two Data Systems Design cards.. half-height, some RAM, some PROMs and a fair bit of logic. One 16Mhz xtal. One connector (28 pins or so) - a bunch of what look to be custom-made boards, with the Marconi label and typing. M-12 and such. Does anyone know more about these? Cheers, Fred -- Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist Visit the VAXlab Project at http://www.pdp11.nl/VAXlab/ Visit the Archives at http://www.pdp11.nl/ Email: waltje(a)pdp11.nl BUSSUM, THE NETHERLANDS / Sunnyvale, CA, USA