AR-B1476 User
’
s Guide
3-2
3.2 SYSTEM SETTING
Jumper pins allow you to set specific system parameters. Set them by changing the pin location of jumper blocks.
(A jumper block is a small plastic-encased conductor [shorting plug] that slips over the pins.) To change a jumper
setting, remove the jumper from its current location with your fingers or small needle-nosed pliers. Place the
jumper over the two pins designated for the desired setting. Press the jumper evenly onto the pins. Be careful not
to bend the pins.
We will show the locations of the AR-B1476 jumper pins, and the factory-default setting.
CAUTION:
Do not touch any electronic component unless you are safely grounded. Wear a grounded wrist strap
or touch an exposed metal part of the system unit chassis. The static discharges from your fingers can
permanently damage electronic components.
3.2.1 Hard Disk (IDE) Connector (CN1)
A 40-pin header type connector (CN1) is provided to interface with up to two embedded hard disk drives (IDE AT
bus). This interface, through a 40-pin cable, allows the user to connect up to two drives in a “daisy chain” fashion.
To enable or disable the hard disk controller, please use the BIOS Setup program. The following table illustrates
the pin assignments of the hard disk drive’s 40-pin connector.
1
2
Figure 3-2 CN1: Hard Disk (IDE) Connector
Pin Signal Pin Signal
1 -RESET 2 GROUND
3
DATA 7
4
DATA 8
5
DATA 6
6
DATA 9
7
DATA 5
8
DATA 10
9
DATA 4
10
DATA 11
11
DATA 3
12
DATA 12
13
DATA 2
14
DATA 13
15
DATA 1
16
DATA 14
17
DATA 0
18
DATA 15
19 GROUND 20 NOT
USED
21 NC 22
GROUND
23 -IOW
A 24
GROUND
25 -IOR
A 26
GROUND
27
-CHRDY A
28
NOT USED
29 NC 30
GROUND
31 -IRQ
A 32 -IO16
33 SA
1 34
NOT
USED
35 SA
0 36 SA
2
37 CS
0 38 CS
1
39
HD LED A
40
GROUND
Table 3-1 HDD Pin Assignment
