Note: These drivers are currently untested because I didn't realize that
using the drivers would need file routines, which are not available right
now. So in fact the drivers are not only untested, they are also unusable
on the target platforms, because they cannot be loaded.
git-svn-id: svn://svn.cc65.org/cc65/trunk@1732 b7a2c559-68d2-44c3-8de9-860c34a00d81
