<Table> Parallel port <Tr> <Td colspan="4"> A DB - 25 connector often used for a parallel printer port on IBM PC compatible computers , with the printer icon . </Td> </Tr> <Tr> <Th> Type </Th> <Td colspan="3"> Point - to - point </Td> </Tr> <Tr> <Th colspan="4"> Production history </Th> </Tr> <Tr> <Th> Designer </Th> <Td colspan="3"> Centronics , IBM </Td> </Tr> <Tr> <Th> Designed </Th> <Td colspan="3"> 1970 - 1981 </Td> </Tr> <Tr> <Th> Manufacturer </Th> <Td colspan="3"> Centronics , Dataproducts , Intel , IBM , Compaq , Nortel , etc </Td> </Tr> <Tr> <Th> Superseded by </Th> <Td colspan="3"> USB ( 1996 ) </Td> </Tr> <Tr> <Th colspan="4"> General specifications </Th> </Tr> <Tr> <Th> Length </Th> <Td colspan="3"> 2.3 cm ( 0.91 in ) </Td> </Tr> <Tr> <Th> Hot pluggable </Th> <Td colspan="3"> Usually not </Td> </Tr> <Tr> <Th> External </Th> <Td colspan="3"> Yes </Td> </Tr> <Tr> <Th> Cable </Th> <Td colspan="3"> Usually up to 25 wires including ground ; optionally shielded </Td> </Tr> <Tr> <Th> Pins </Th> <Td colspan="3"> 8 data , 4 output control , 5 input control , 8 ground </Td> </Tr> <Tr> <Th> Connector </Th> <Td colspan="3"> DB - 25 , DB25F , `` Centronics '' 36 - pin Amphenol , DC - 37 , others </Td> </Tr> <Tr> <Th colspan="4"> Electrical </Th> </Tr> <Tr> <Th> Signal </Th> <Td colspan="3"> 0 to + 5.0 volt DC </Td> </Tr> <Tr> <Th> Max . voltage </Th> <Td colspan="3"> 5 volts DC </Td> </Tr> <Tr> <Th colspan="4"> Data </Th> </Tr> <Tr> <Th> Data signal </Th> <Td colspan="3"> Parallel </Td> </Tr> <Tr> <Th> Width </Th> <Td colspan="3"> Variable </Td> </Tr> <Tr> <Th> Bitrate </Th> <Td colspan="3"> PP : 150 kbit / s , EPP : 2 MB / s ECP : 2.5 MB / s </Td> </Tr> <Tr> <Th> Max . devices </Th> <Td colspan="3"> </Td> </Tr> <Tr> <Th> Protocol </Th> <Td colspan="3"> Application dependent </Td> </Tr> <Tr> <Th colspan="4"> Pin out </Th> </Tr> <Tr> <Td colspan="4"> </Td> </Tr> <Tr> <Td colspan="4"> IBM PC - compatible parallel port pinout </Td> </Tr> </Table>
<Table> Parallel port <Tr> <Td colspan="4"> A DB - 25 connector often used for a parallel printer port on IBM PC compatible computers , with the printer icon . </Td> </Tr> <Tr> <Th> Type </Th> <Td colspan="3"> Point - to - point </Td> </Tr> <Tr> <Th colspan="4"> Production history </Th> </Tr> <Tr> <Th> Designer </Th> <Td colspan="3"> Centronics , IBM </Td> </Tr> <Tr> <Th> Designed </Th> <Td colspan="3"> 1970 - 1981 </Td> </Tr> <Tr> <Th> Manufacturer </Th> <Td colspan="3"> Centronics , Dataproducts , Intel , IBM , Compaq , Nortel , etc </Td> </Tr> <Tr> <Th> Superseded by </Th> <Td colspan="3"> USB ( 1996 ) </Td> </Tr> <Tr> <Th colspan="4"> General specifications </Th> </Tr> <Tr> <Th> Length </Th> <Td colspan="3"> 2.3 cm ( 0.91 in ) </Td> </Tr> <Tr> <Th> Hot pluggable </Th> <Td colspan="3"> Usually not </Td> </Tr> <Tr> <Th> External </Th> <Td colspan="3"> Yes </Td> </Tr> <Tr> <Th> Cable </Th> <Td colspan="3"> Usually up to 25 wires including ground ; optionally shielded </Td> </Tr> <Tr> <Th> Pins </Th> <Td colspan="3"> 8 data , 4 output control , 5 input control , 8 ground </Td> </Tr> <Tr> <Th> Connector </Th> <Td colspan="3"> DB - 25 , DB25F , `` Centronics '' 36 - pin Amphenol , DC - 37 , others </Td> </Tr> <Tr> <Th colspan="4"> Electrical </Th> </Tr> <Tr> <Th> Signal </Th> <Td colspan="3"> 0 to + 5.0 volt DC </Td> </Tr> <Tr> <Th> Max . voltage </Th> <Td colspan="3"> 5 volts DC </Td> </Tr> <Tr> <Th colspan="4"> Data </Th> </Tr> <Tr> <Th> Data signal </Th> <Td colspan="3"> Parallel </Td> </Tr> <Tr> <Th> Width </Th> <Td colspan="3"> Variable </Td> </Tr> <Tr> <Th> Bitrate </Th> <Td colspan="3"> PP : 150 kbit / s , EPP : 2 MB / s ECP : 2.5 MB / s </Td> </Tr> <Tr> <Th> Max . devices </Th> <Td colspan="3"> </Td> </Tr> <Tr> <Th> Protocol </Th> <Td colspan="3"> Application dependent </Td> </Tr> <Tr> <Th colspan="4"> Pin out </Th> </Tr> <Tr> <Td colspan="4"> </Td> </Tr> <Tr> <Td colspan="4"> IBM PC - compatible parallel port pinout </Td> </Tr> </Table>
the number of pins in a parallel port connector are
the number of pins in a parallel port connector are
8 data , 4 output control , 5 input control , 8 ground
8 data , 4 output control , 5 input control , 8 ground