Installation guide
3
Step 6: 
OPTIONAL. If you want the LED in your 
computer to light whenever there is activity on the 
SCSI bus, disconnect the LED cable from the LED 
connector on the motherboard and connect it to the 
LED connector on the host adapter. 
Step 7: 
Make sure that all your SCSI devices have 
been set with unique SCSI IDs from 0 to 6. (Refer to 
your device documentation for SCSI ID settings and 
instructions on changing the default settings.) 
Caution: 
AHA-2910C host adapters support 
only single-ended SCSI devices. Differential 
SCSI devices may be damaged if you connect 
them to the host adapter. Read the device 
documentation.
Installing Internal SCSI Devices
The SCSI devices inside a computer are attached to an 
internal SCSI cable. The last device on the cable must be 
terminated. Most internal SCSI devices have a jumper or 
switch that controls termination. Refer to the device’s 
documentation on enabling or disabling termination.
If you purchased your AHA-2910C as part of an Adaptec 
kit, you can use the 50-pin internal SCSI cable to connect 
up to two internal SCSI devices. 
Note: 
Before you begin, make sure your internal 
SCSI devices are not terminated. 
Step 1: 
Find the colored stripe on the 50-pin 
internal SCSI cable and then align it with Pin-1 on the 
host adapter’s connector. Pin-1 is usually identified by 
a 
▲
, or “1” on the connector.
Step 2: 
Plug the internal SCSI cable into the host 
adapter’s connector.
1
1
LED Cable from
Motherboard
Pin 1
LED Connector
on Host Adapter
2-pin
LED
Cable
Colored Stripe
(typically red or blue)
50-pin SCSI 
Ribbon Cable
Pin 1 
Indicator 
Host Adapter’s Connector










