User`s manual

3.3 Hardware Conﬁguration

1. Install the 21164 Alpha microprocessor in ZIF socket U42.

a. Observe antistatic precautions.

b. Lift the ZIF socket actuator handle to a full 90° angle.

c. Make sure that all the pins on the 21164 are straight.

d. The ZIF socket and 21164 are keyed to allow for proper installation.

Align the 21164, with its missing AD01 pin, with the corresponding

plugged AD01 position on the ZIF socket. Gently lower into position.

e. Close the ZIF socket actuator handle to its locked position.

2. If you are installing a 266-MHz microprocessor, you do not need to change

any other components or associated jumper settings.

If you are installing a 300-MHz or 333-MHz microprocessor, you must

also reconﬁgure the clock divisor jumpers on header J1 as described in

Table 2–1. You must also change the oscillator. Refer to Appendix A for

part numbers and sources.

3. Install the heat sink and heat sink fan as directed in the following steps.

Heat sinks and accompanying fans are available from Digital in kit form,

or from recommended vendors as kits or component piece parts.

A TS30 manual nut/torque driver with the following attachments is

required to afﬁx the heat sink and fan to a 21164:

• 1/4-in hex bit

• 7/16-in socket with 1/4-in hex drive

• #2 Phillips screwdriver bit

Note

Install the heat sink only after the 21164 has been assembled to the

board ZIF socket.

Starting and Using the EB164 3–3