Add Appendix 5 "Initial Settings" (#47)

Add Appendix 5 "Initial Settings"

Author: jmdyck

docs/appendix-5-initial-settings.markdown

@@ -0,0 +1,24 @@
+# Appendix 5. Initial Settings
+
+The various switches and useful variables in MDL are initially set up with the following values:
+
+    <ACTIVAIE-CHARS <STRING <ASCII 7> <ASCII 19> <ASCII 15>>>
+                          ;"Tenex and Tops-20 versions only"
+    <DECL-CHECK T>
+    <UNASSIGN <GUNASSIGN DEV>>
+    <GC-MON <>>
+    <SET INCHAN <SETG INCHAN <OPEN "READ" "TTY:">>>
+    <UNASSIGN KEEP-FIXUPS>
+    <UNASSIGN <GUNASSIGN NM1>>
+    <UNASSIGN <GUNASSIGN NM2>>
+    <SET OBLIST <SETG OBLIST (<MOBLIST INITIAL 151> <ROOT>)>>
+    <SET OUTCHAN <SETG OUTCHAN <OPEN "PRINT" "TTY:">>>
+    <OVERFLOW T>
+    <UNASSIGN REDEFINE>
+    <RSUBR-LINK T>
+    <SETG <UNASSIGN SNM> "working-directory">
+    <SPECIAL-CHECK <>>
+    <SPECIAL-MODE UNSPECIAL>
+    <SET THIS-PROCESS <SETG THIS-PROCESS <MAIN>>>
+    <ON "CHAR" ,QUITTER 8 0 ,INCHAN>
+    <ON "IPC" ,IPC-HANDLER 1>               ;"ITS version only"