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-Placeholder.
+## PDP-10 Muddle written in MIDAS assembly language
+
+`<mdl.int>` contains Muddle for TOPS-20, from around 1981.
+There should also be support for ITS, but it won't build as is.
+
+`MUDDLE` contains Muddle for ITS, from around 1973.
+
+`mim` contains Machine-Independent MDL for TOPS-20 and VAX.