More README updates

README.md

@@ -11,7 +11,6 @@ a directory tree or an entire volume:
   - Multi-level directory sort
   - Manipulating the case of filenames *
   - Manipulating the format of time and date information *
-  - Zeroing free blocks
 
 *Sortdir* is intended to help users migrate to the new ProDOS 2.5 release,
 which is currently in alpha.  The code has been testing with ProDOS 2.5a8,
@@ -72,7 +71,65 @@ overwritten.)
 
 ![](/Screenshots/Interactive.png)
 
-TODO
+When *Sortdir* is launched without any command line parameters, a very
+primitive interactive user interface is shown, as seen above.  The program
+asks questions sequentially.  If you make a mistake and want to go back,
+entering the `^` (caret) character will go back to the previous question.
+
+When in doubt, the `-` (minus) character is mapped to the most conservative
+choice for each option.
+
+The following prompts are presented in order:
+
+  - *Path of starting directory*  Enter an absolute or relative path here.
+    The directory operations will start in this directory (unless the
+    'whole volume' option is selected, in which directory operations will
+    begin in the volume directory of the of the volume which contains the
+    directory specified here.)
+  - *What to process ...* There are three options:
+    - `-` - Only operate on the specified directory.
+    - `r` - Operate recursively, descending the tree from the specified
+      directory.
+    - `v` - Operate on the entire volume, descending the tree from the volume
+      directory.
+  - *Multi-Level directory sort ...* Here you can enter up to four levels of
+    directory sorting.  For each level, the following choices are available:
+    - `n` - Sort by filename in ascending alphabetical order (A-Z).
+    - `N` - Sort by filename in descending alphabetical order (Z-A).
+    - `i` - Sort by filename in ascending alphabetical order (A-Z) in a case
+            insensitive manner.
+    - `I` - Sort by filename in descending alphabetical order (Z-A) in a case
+            insensitive manner.
+    - `d` - Sort in ascending order of modification time/date.
+    - `D` - Sort in descending order of modification time/date.
+    - `t` - Sort in ascending order of file type (considered as an integer)
+    - `T` - Sort in descending order of file type (considered as an integer)
+    - `f` - Sort in directories ("folders") to the top.
+    - `F` - Sort in directories ("folders") to the bottom.
+    - `b` - Sort in ascending order of file size in blocks.
+    - `B` - Sort in descending order of file size in blocks.
+    - `e` - Sort in ascending order of file size in bytes (ie: EOF position).
+    - `E` - Sort in descending order of file size in bytes (ie: EOF position).
+    - `-` - Entering `-` (minus) will end the entry of sort options and move
+            on to the next section.
+  - *Filename case conversion ...*
+    - `-` -
+    - `l` -
+    - `u` -
+    - `i` -
+    - `c` - 
+  - *On-disk date format conversion ...*
+    - `-` -
+    - `n` -
+    - `o` -
+  - *Attempt to fix errors? ...*
+    - `-` -
+    - `?` -
+    - `a` -
+  - *Allow writing to disk? ...*
+    - `-` -
+    - `w` -
+
 
 ### Command Line Options
 
@@ -112,29 +169,3 @@ time format back to the legacy format.
 Not yet implemented in ProDOS-8 version.
 
 
-### Directory Check and Repair
-
-TODO
-
-### Directory Sort
-
-TODO
-
-### Filename Case Change
-
-TODO
-
-### Date and Time Format
-
-This allows the format of the modification time and creation time fields in
-ProDOS directories to be converted from the legacy ProDOS format (ProDOS <2.5)
-to the new date and time formats introduced in ProDOS 2.5.  These new formats
-extend the range of dates that may be represented, in a backwards-compatible
-manner.  *Sortdir* also allows conversion from the new ProDOS 2.5 date and
-time format back to the legacy format.
-
-### Zeroing Free Blocks
-
-Not yet implemented in ProDOS-8 version.
-
-