This is the beginnings of a alternative version of the PDP-7 Unix

system which corresponds to a later development point, around mid-1971,
where the system had lost the "dd" directory and gained . and ..
entries. This is close to the system as described in
http://www.tuhs.org/Archive/PDP-11/Distributions/research/McIlroy_v0/UnixEditionZero.txt
except there are no pathnames.

To use this version: cd build; make alt; make altrun

src/other/wktls.s

@@ -23,7 +23,9 @@ argloop:
      jmp setlong
 
    lac argptr		" It wasn't -l, so save it as the dir to open
+#ifndef NO_DD
    dac 8f
+#endif
    dac 9f
    skp
 
@@ -79,7 +81,11 @@ entryloop:
    lac bufptr
    dac statfile		" Copy the pointer to the status call
    lac statbufptr	" Get the file's details into the statbuf
+#ifdef NO_DD
+   sys status; statfile:0
+#else
    sys status; 8:curdir; statfile:0
+#endif
    spa
      jms fileend