Hey, I have two MSV11-QBs here, each 2 meg parity QBUS memories. I'd like to put both in the same system, creating a 4 meg PDP-11, but I can't find the DIP switch settings for them. The PCB in the PDF has the DIP switches placed differently on the board, and the settings I try don't seem to work, I'm throwing memory errors, and the boards appear in the wrong places. the PCB revision is 5017547-01-D1-P2 while the PDF depicts a C1. I don't know if that's the problem, but the boards do look different. What I previously had was __Q22_______ _______Q/CD______ / \ / \ |Emul|DHV-|DHV-|DELQ|Gran|MSV-|PDP-| |ex S|11 |11 |A |t co| 11 |11/ | |CSI | | | |ntin| |83 | | | | | |uity| QB | | | | | | | | 0- |CPU | |----| | |----|----| 2m | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 7 6 5 4 3 2 1 What I've changed it to is: _______Q22_______ _______Q/CD______ / \ / \ | |TK50|DHV-|DHV-|DELQ|MSV-|MSV-|PDP-| | |Cont|11 |11 |A |11 | 11 |11/ | | | | | | | | |83 | | | | | | | QB | QB | | | | | | | | 2- | 0- |CPU | |----|----| | |----| 4m | 2m | | |RQDX|Emul| | | | | | | | 3 |ex S| | | | | | | | |CSI | | | | | | | | | | | | | | | | | | | | | | | | | 8 7 6 5 4 3 2 1 With both memory boards in, the CPU diag ROM reports that I have small ROMs placed around the memory space and one RAM board somewhere in space of some strange size. I assume that's because the DIP switch settings are wrong. Anyone have the docs? Or know what the DIP switch settings are for setting them to 0-2M and 2-4M? Thanks very much in advance for your help! -toresbe