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+# The is currently a proposal only.
+
+### Overview
+
+The command style is temporary and subject to change. The commands and responses were chosen to in a Grbl style rather than a Marlin type style. This will allow Grbl senders to be used without issues. If a Marlin style is preferred, changes can be made after the system is fully tested.
+
+### Commands
+
+**$F**
+
+Show all the files. This is recursive and will search all subdirectories. Each file will print like this...
+
+[FILE: \FOO.NC 29547]
+
+...where \FOO.NC is the filename. including the directory. In this case the directory is the root. The number following the file name is the file size.
+
+
+
+All filenames must be uppercase for now because Grbl only uses upper case.
+
+**$FM**
+
+Mount the SD card
+
+**$FU**
+
+Unmount the SD card
+
+**$F=\FOO.NC**
+
+Run file \FOO.NC 
+
+### Other Actions
+
+**Pause/Restart**
+
+Just use the normal grbl cycle start and feedhold commands
+
+**Stop/Quit a file**
+
+Initially this will be Grbl Reset. If that does not work out then $FQ will be added.
+
+**Status**
+
+I am not sure how to send status. I think adding an optional thing to the ? is probably the best. Maybe a percentage that gets added in when an SD file is running.
+
+<Idle|WPos:195.000,144.000,19.000|Bf:15,128|FS:0.000,0.000|Pn:P|WCO:-195.000,-144.000,-19.000|SD:45.5%>
+ 
+
+### Errors
+
+There will be some sort of state machine type thing to make sure mount, run, unmount, etc do not cause undesirable effects.
+