Update README.md

Made clearer the need to not mix MUD84 sources or binaries (from tape branch) with these MUD86 sources, as they are not compatible and will fail to compile or run as expected.
PDP-10 · Dec 15, 2019 · 455d3fa · 455d3fa
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diff --git a/README.md b/README.md
@@ -29,3 +29,6 @@ death are handled differntly so you dont need multiple dead rooms. Hence this mu
 the tape in the zip branch.
 
 Full build instructions including how to set up a PDP10 with TOPS-10 using SIMH is at https://www.quentin.org.uk/tag/pdp10/
+
+Do not mix MUD84 sources or binaries (from tape) with these MUD86 sources as they are not compatable and will fail to compile
+or run as expected.