(cable side)
| Pin | Signal | Description |
|---|---|---|
| 1 | /RESET | Reset |
| 2 | GND | Ground |
| 3 | DD7 | Data 7 |
| 4 | DD8 | Data 8 |
| 5 | DD6 | Data 6 |
| 6 | DD9 | Data 9 |
| 7 | DD5 | Data 5 |
| 8 | DD10 | Data 10 |
| 9 | DD4 | Data 4 |
| 10 | DD11 | Data 11 |
| 11 | DD3 | Data 3 |
| 12 | DD12 | Data 12 |
| 13 | DD2 | Data 2 |
| 14 | DD13 | Data 13 |
| 15 | DD1 | Data 1 |
| 16 | DD14 | Data 14 |
| 17 | DD0 | Data 0 |
| 18 | DD15 | Data 15 |
| 19 | GND | Ground |
| 20 | KEY | Key |
| 21 | n/c | Not connected |
| 22 | GND | Ground |
| 23 | /IOW | Write Strobe |
| 24 | GND | Ground |
| 25 | /IOR | Read Strobe |
| 26 | GND | Ground |
| 27 | IO_CH_RDY | |
| 28 | ALE | Address Latch Enable |
| 29 | n/c | Not connected |
| 30 | GND | Ground |
| 31 | IRQR | Interrupt Request |
| 32 | /IOCS16 | IO ChipSelect 16 |
| 33 | DA1 | Address 1 |
| 34 | n/c | Not connected |
| 35 | DA0 | Address 0 |
| 36 | DA2 | Address 2 |
| 37 | /IDE_CS0 | (1F0-1F7) |
| 38 | /IDE_CS1 | (3F6-3F7) |
| 39 | /ACTIVE | Led driver |
| 40 | GND | Ground |
The parallel bus transfers data from hard disks and optical stores (CD and DVD) and back. It is known as Parallel ATA and today gives a up the place Serial ATA. Last version uses a 40-contact wire with 80 veins (half on "ground"). Each such cable allows to connect, a maximum, two devices when one works in a mode "master", and the second - in "slave". Usually the mode is switched by means of the small lintel on the device.