(Graphic Environment OS) операционная система Geos ОС для карманных компьютеров, смартфонов и т. п. Разработана в 1996 г. фирмой Geoworks
A small windowing, microkernel (less than 64 kbytes long) operating system written in heavily bummed assembly language for MS-DOS computers. It multitasks rather nicely on a 6 Mhz Intel 80286 with at least 512K memory. It was adapted to PDAs by adding pen recognition, which doesn't work very well.