https://en.wikipedia.org/wiki/MACRO-11 https://en.wikipedia.org/wiki/MACRO-11 and linked from that page http://bitsavers.trailing-edge.com/pdf/dec/pdp11/rsx11

https://en.wikipedia.org/wiki/MACRO-11 https://en.wikipedia.org/wiki/MACRO-11 and linked from that page http://bitsavers.trailing-edge.com/pdf/dec/pdp11/rsx11/RSX11M_V2/DEC-11-OIMRA-A-D_MACRO_75.pdf http://bitsavers.trailing-edge.com/pdf/dec/pdp11/rsx11/RSX11... There are probably better references, but that's what I found in a quick look.