Parallel ATA

Computer storage interface standard Parallel ATA Two ATA motherboard sockets above, with an ATA connector belowType Internal storage device connectorProduction historyDesigner Western Digital and Compaq,subsequently enhanced by many othersDesigned 1986Superseded by Serial ATA (2003)General specificationsHot pluggable NoExternal NoCable 40 or 80 conductor ribbon cablePins 40DataWidth 16 bitsBitrate Half-duplex:8.3 MB/s per ATA channel originally later 33, 66, 100 and 133 MB/s per ATA channelMax. devices TwoProtocol ParallelPinout Pin 1 ResetPin 2 GroundPin 3 Data 7Pin 4 Data 8Pin 5 Data 6Pin 6 Data 9Pin 7 Data 5Pin 8 Data 10Pin 9 Data 4Pin 10 Data 11Pin 11 Data 3Pin 12 Data 12Pin 13 Data 2Pin 14 Data 13Pin 15 Data 1Pin 16 Data 14Pin 17 Data 0Pin 18 Data 15Pin 19 GroundPin 20 Key or VCC_inPin 21 DDRQPin 22 GroundPin 23 I/O writePin 24 GroundPin 25 I/O readPin 26 GroundPin 27 IOCHRDYPin 28 Cable selectPin 29 DDACKPin 30 GroundPin 31 IRQPin 32 No connectPin 33 Addr 1Pin 34 GPIO_DMA66_DetectPin 35 Addr 0Pin 36 Addr 2Pin 37 Chip select 1PPin 38 Chip select 3PPin 39 ActivityPin 40 Ground Parallel ATA (PATA), originally AT Attachment, also known as Integrated Drive Electronics (IDE), is a