Some PDP11 related Questions..

Hi, I have A M8186 (KDF11-A Rev D) and an M8047-CA (MXV11-AC) currently in an H9275 Backplane. I've fiddeled around an wondering why I can't access the ROMs on the M8047 at 173000. Finally found it, they get active ad 773000 in the ODT, since the M8047 is using the BBS7 Signal from the CPU to decode the ROM Address. My question is now regarding the Bootstrap setting, the Manual says that in ODT mode the BDAL16 and BDAL17 are enabled to get access to the higher memory contents. How is this handeled while bootstrapping? I can't set a bootstrap address of 773000 on the KDF11, it boots now in ODT Mode and displays 173000 after Reset, thati's the jumpered address. How is this (BBS7) handeled while bootstrapping? Is the BBS7 low while bootstrap at 173000 or is the M8047 incompatible with this processor? (I've not tested to bootstrap since I don't know what is in the ROMs and I don't have an RX02 nor TU58 to connect, want to put in a M7555 so I have to change the ROMs for sure). As far as I know this KDF11 should be able to handle 22 bits (420HD0 on the Handle, 5013326 D-P4 on the Board) is that the case? Next question about RAMs: I do have some QBUS Memory boards with PMI connectors (M6708, NatSemi NS638, Chrislin CI-MV8 to be concrete) does anyone know if I can use one of them with the KDF11 (or at least the KDJ11?) I hve a KA630 too, but I need PDP11 RAM, the 16KW on the M8047 is really a bit small.... Next question is about an M7656 Graphic board that I have laying around here. Where was this used and are there any docs available? 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