Specifications

CHAPTER 3
I/O Features
Disk Drives 27
Hard Disk Connectors 3
The internal hard disk has a standard 40-pin ATA connector and a separate 4-pin power
connector. The 40-pin connector cable is part of the cable harness attached to the main
logic board by the internal chassis connector. The power cable is attached directly to the
power supply.
The exact locations of the ATA connector and the power connector are not specified, but
the relative positions must be as shown in Figure 3-2 so that the cables and connectors
will fit.
Pin Assignments 3
Table 3-4 shows the pin assignments on the 40-pin ATA (IDE) 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 (IDE) hard disk connector
Pin number Signal name Pin number Signal name
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 Reserved 22 GROUND
23 DIOW 24 GROUND
25 DIOR 26 GROUND
27 /IORDY 28 Reserved
29 Reserved 30 GROUND
31 INTRQ 32 /IOCS16
33 DA1 34 /PDIAG
35 DA0 36 DA2
37 /CS0 38 /CS1
39 /DASP 40 GROUND