On Mon, Feb 8, 2016 at 3:30 PM, Guy Sotomayor <[email protected]> wrote: >> On 2/8/16 10:09 AM, Guy Sotomayor wrote: >>> So, things are moving forward. I also wanted to get folk's opinion on >>> the need to actually produce >>> an SPC form factor board. In other words (and sort of in line with how >>> peripherals were done on the >>> original 11/20) is it OK to have the MEM11 be outside of the 11/20 >>> chassis and connect via BC11A (my replica) cables?
For my own case, I have a 3-box 11/20 that I need to restore (as I've posted before, it was chopped apart and dumpstered, and I recovered it from there). The majority of the second and third boxes is MM11-E core memory units (I have N-1 because one of my co-workers nabbed a core plane to hang on the wall). My plan with the MEM11 has been to restore the CPU cabinet and use the memory on the MEM11 instead of the MM11-E units, leaving me plenty of space and power supply for peripherals with the ultimate goal of running UNIX v1 on it (I also have an RK11C that would be a secondary restoration project, or an RK11D that should "just work") With that, I had been expecting that the MEM11 would be an SPC board that would just sit in a DD11CK with some other periperhals. Apparently, it's sounding like there's too much "stuff" for a single quad-height card then? Is it component density or having to go to a 4-layer board that's an issue? > As Ian stated in a subsequent post, it'll probably be something like a 1U > box with appropriate power supply. That will certainly be functional, but it seems to up the cost quite a bit. I would rather have an external something that works than not have anything at all, but I think an SPC, if possible, would be the most portable of solutions. If this was an external device, would it just have a pair of 60-pin cables to your replica BC11A? Would it then have an onboard terminator or option to install a terminator? I get that you won't be selling the MEM11 as a bare board, but it doesn't seem that the intended audience would be put out by soldering their own 60-pin connectors and/or a bunch of terminating resistors if it needed to be at the end of a chain or in the middle. -ethan
