Thanks a lot, folks! And of course, thanks so much Al for bitsavers -- the DEC archives there, for me at least, have made this whole hobby possible! I have an early (serial 152) 11/45 that I've been restoring. Just now to the point in CPU debug where I can reliably toggle in and run simple programs. Next step will be to get some serial I/O going so I can conveniently load some more thorough diagnostics and be sure the CPU and memory are completely shaken out. Then on to working on storage. I have a pretty complete set of CPU spares, but they are of various different revisions, having differing sets of green wires etc. I'd like to have a look at the ECOs at some point so I can properly sort out and record what is what, and/or possibly bring all the boards up to a consistent level. cheers, --Fritzm.