Make keyboard and mouse work. This let us actually try SqueakNOS. Make hard drives work, this will let us code SqueakNOS from within SqueakNOS.Having keyboard and mouse opened the door to playing with the booted system. Now, we want to be able to save the changes, so we need some persistency. One idea (taken, again, from the old SqueakNOS), was to implement serial port support, which is already done, and some type of File System over it.
Other possibility is to implement hard disk drivers, which is also done, and after that basic FAT32 support. This will let us open .sources and .changes files.