tty: fix bracketing
filesys: fix gcc warn/errors
6809: unbitrot versus changes we've made elsewhere

Still not a "real" port, but it compiles again
zx128: scroll functions fix
zx128: disable switchin/switchout since they are not implemented and cause a di:halt
zx128: keyboard support for tty
zx128: uzi.lnk added
Merge pull request #12 from atsidaev/zx128-clean

zx128: uzi.lnk, keyboard support and fixes