--- /dev/null
+options:
+
+l: local extensions enabled
+n: no register messages
+s: symmetric range for integers: MIN(INTEGER) = -MAX(INTEGER)
+w: disable warnings
+x: make every name global (for ADB)
+A: extra array bound checks
+I: look in directory for definition modules
+L: no FIL/LIN instructions
+M: maximum identifier length
+R: runtime checks
+U: allow underscores in identifiers
+V: object sizes and alignments
+W: enable warnings
+3: strict 3rd edition Modula-2
+-: to pass debugging options
+
+Debugging options:
+
+i: display number of structures allocated and number of lines read
+t: run lexical analyzer only
+C: dump of constant expressions
+F: display size of every file read.
+S: define/lookup symbol table access dump
+X: parse-tree dump
+