Brian Hechinger wrote: On Mon, Oct 19, 2009 at 05:37:39PM +0200, Johnny Billquist wrote: But all the pieces are documented, and the documents are available on the internet... I wonder how hard/impossible it would be to implement this entirely in an FPGA of some sort. That would be a LOT of work, but extremely cool. Start with the basic PDP-11/70 in that case. Once you have that down, extending it to an 11/74 should be less of a problem. I know of several attempts in the past to do PDP-11s in FPGA. I don't know if any of them have reached a working stage, but they have also been aiming a bit lower. Going for 11/40 type machines. But it should all be doable, I think. Just given enough time and energy. :-) Johnny