The 777 was a clean sheet design that incorporated fly-by-wire as it was designed in the late 1980s/early 1990s. Thusly it cannot be operated without the comp

The 777 was a clean sheet design that incorporated fly-by-wire as it was designed in the late 1980s/early 1990s. Thusly it cannot be operated without the computers running, whereas the 737 can and has. Its also 4 times larger than the 737, meaning that the more direct way control surfaces are moved by the controls in the 737 is not possible on the 777.