<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2016) (Learn how and when to remove this template message) </Td> </Tr> <Table> <Tr> <Th> Operating systems </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Th> Common features </Th> </Tr> <Tr> <Td> <Ul> <Li> Process management </Li> <Li> Interrupts </Li> <Li> Memory management </Li> <Li> File system </Li> <Li> Device drivers </Li> <Li> Networking </Li> <Li> Security </Li> <Li> I / O </Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table>

Which i/o device is used for standard input