Den fre 21 dec. 2018 kl 12:03 skrev Rod Smallwood via cctalk < cctalk at classiccmp.org>: Do you know or just guessing? Why would it be some kind of test gear with a AR, MQ, and MB designation? I searched a bit more and the PDP-6 has exactly AR, MQ and MB registers. My guess it comes from a PDP-6 since it was not used in the PDP-1, PDP-4 and PDP-5 from looking in the maintenance manuals.. Then I found this manual: http://bitsavers.trailing-edge.com/pdf/dec/pdp6/F-67_circuitInstr_May66.pdf Which confirms that is from a PDP-6. Page 3-13. It also makes sense since one of the other boards from the same seller has a tag on it which indicate PDP-6. Case closed..

That's an impressive piece of work. I've been thinking about emulating a CRT display in an FPGA, it's not a simple task but this project has delivered exactly that. Something like that might be interesting to LCM, to deliver a realistic DD60 display without needing to run the real (somewhat fragile) old hardware. paul