As copied from code.google.com/rzzzwilson.

idasm/disasmdata.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+
+"""
+This module disassembles one imlac machine word into a data instruction
+string.
+"""
+
+def disasmdata(word):
+    result = ("DATA", "%06o" % word)
+    return result
+
+if __name__ == "__main__":
+    for word in xrange(0177777):
+        (op, fld) = disasmdata(word)
+        print "%07o: %s %s" % (word, op, fld)