Brain dump more TODOs

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@@ -43,6 +43,17 @@ syntax-case.
 - goto
 - external
 
+* TODO start porting ps-compiler
+
+Above is just the emulation layer.  The real work is the ps-compiler itself,
+which is written in Scheme 48 (and also Common Lisp apparently).  This will
+involve:
+
+ - rewrite s48 interfaces as guile modules
+ - rewrite code using records to use Guile's (or emulate s48?)
+ - rewrite macros from explicit renaming to syntax-case
+ - ... and many more unforeseen challenges...
+
 * TODO prepare some compatibility tests
 
 We need to find collect all the "real-world" Pre-Scheme we can get our hands on,
@@ -71,4 +82,7 @@ Exhibit A is the "hello world" from the manual:
         -1)))
 #+END_SRC
 
+A bunch of tests are included in scheme48-1.9.2/ps-compiler/prescheme/test.
+Nice!
+
 * TODO write more TODOs