PDP-11

11/03 processor with 4-Kword MOS RAM DLV11 Serial Line Unit (system cosole) REV11-E (240-ohm terminators for Q18) QBUS termination is a complex subject; when you have multiple backplane sections, connected by cables, each section has 'termination'. That's what this REV11-E card is; it's also the QBUS 'out' to the card in the 780 CPU which the console -11 uses to control the /780 CPU. Why it's in the middle slot, I'm not sure (unless things have been moved around)? MSV11-?? (My list doesn't contain an '-EE', but it's some sort of small MOS memory, Q18) RXV11 (RX01 8" floppy disk controller) In theory, the M8044-EE should be an "MSV11-DE" (not "MSV11-EE", that would be an M8045-EE), but none of my documentation, including the M8044 prints, covers such a variant. Maybe I need to look in the /780 prints, it may be a special variant for use in the /780 console machines. LSI-11/73 CPU; a nice machine, if you can eventually get it running. You'll want a bunch more memory (note that the M8044/8045 cards are Q18, and so you can only have up to 256KB with them - they _WILL NOT WORK_ in a system with more than 256KB in it). You mean an M9047? I would start with just the 11/03 CPU and the console card; hook it up to something, and see if you can get it to talk to the console. (Configure the CPU to halt, and fall into Console ODT, on power-on.) It's probably worth getting one of the various LSI-11 CPU handbooks: Microcomputer Handbook (1976-77) Microcomputer Processors (1978-79) Microcomputer Processor Handbook (1979-80) Microcomputers and Memories Handbook (1981) Microcomputers and Memories Handbook (1982) they all cover the quad-width 11/03 CPU. Although they're probably available online, it's very handy to have a hard-copy one; those are available on eBay and such. That backplane is probably a so-called 'serpentine' backplane, i.e. ones in which the (dual) slots are numbered: 1 2 4 3 5 6 8 7 so the console would need to go in '3' if it's the only card other than the CPU (at least, if you want it to be able to do interrupts). Once you get it working in that configuration, you can configure and add the memory card (if you can figure out what the devil it is ;-). And then the RX01 controller. The REV-11 isn't needed in this configuration. The boot PROM for this machine was actually on the card in the /780 CPU, so eventually you'll need a replacement - something like a BDV11 or something (they are available, and not too expensive). Yeah, that's what it looks like. Actually, an 11/73, but yes, definitely not part of the original system. I don't know if it will work in that backplane without the backplane being upgraded from Q18; it might, but that would need some investigation. Noel