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Table 3-4 shows the signal assignments on the 44-pin portion of the hard disk connector. A slash (/) at the beginning of a signal name indicates an active-low signal.
Table 3-4 Pin assignments on the ATA hard disk connector
| 1 | /RESET | 2 | GROUND |
| 3 | DD7 | 4 | DD8 |
| 5 | DD6 | 6 | DD9 |
| 7 | DD5 | 8 | DD10 |
| 9 | DD4 | 10 | DD11 |
| 11 | DD3 | 12 | DD12 |
| 13 | DD2 | 14 | DD13 |
| 15 | DD1 | 16 | DD14 |
| 17 | DD0 | 18 | DD15 |
| 19 | GROUND | 20 | KEY |
| 21 | DMARQ | 22 | GROUND |
| 23 | /DIOW | 24 | GROUND |
| 25 | /DIOR | 26 | GROUND |
| 27 | IORDY | 28 | CSEL |
| 29 | /DMACK | 30 | GROUND |
| 31 | INTRQ | 32 | /IOCS16 |
| 33 | DA1 | 34 | /PDIAG |
| 35 | DA0 | 36 | DA2 |
| 37 | /CS0 | 38 | /CS1 |
| 39 | /DASP | 40 | GROUND |
| 41 | +5V LOGIC | 42 | +5V MOTOR |
| 43 | GROUND | 44 | Reserved |
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CSEL, /DASP, /IOCS16, and /PDIAG are not used; see Table 3-5 |
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