ROI PDP11 Qbus Cards..

Hi, I have 2 Q-Bus Memory Boards from "ROI", one is an 256KiB the other an 1MB Double size Board. Both are equipped with an AM2964 Memory Controller and the 1MB Board seams to be the successor of the 256KiB Board, small changes besides the Memory. Both Boards have 4x9 Memory Chips (4164/41256) and two 74S280 Parity Generators on it. I've tested the memories with some xxdp Tests, some of them are complaining that there are no parity Registers on the Boards and are aborting. VMSACO tests both boards w/o Errors but mentiones that there are no Paritiy Registers. What have they build here? Has anyone documentation for that Boards? The 256KB Board has only "ROI RAM1" on the PCB, the 1MB one has ROI "MRL-11" on it and a sticker with "M1M10311". Than I have another ROI Board, It has two rows of blinkenlights on the front, displaying the state of some BUS Signals, but there is also a 10 Pin Berg Connector on it. The board mostly consists of an empty Pin hole area but there is also an Xtal-Oszillator with 5.0688Mhz, a GAL, a 74HC39, an 74HC74, an 74HC4040 and an 74HC04 on it. This Board is Labeled "ROI BSB11". I think that the berg connector provides some access for Reset and Halt Switches, Electonics possibly are for the DCOK and ACOK Signals? Does anyone know more? Kind Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741