User`s manual

3.3 Hardware Conﬁguration

1. Install the Alpha 21064A microprocessor in ZIF socket U36.

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 Alpha 21064A are straight.

d. The ZIF socket and Alpha 21064A are keyed to allow for proper

installation. Align the Alpha 21064A, 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 275-MHz microprocessor, you do not need to change

any other components or associated jumper settings.

If you are installing a 200-MHz or 233-MHz microprocessor, you must

replace oscillator U41 and PLL U40 with the appropriate parts. Refer to

Appendix A for part listings. You must also reconﬁgure the clock divisor

jumpers on header J3, as described in Table 2–2.

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 an Alpha 21064A:

• 1/4-in hex bit

• 3/8-in socket with 1/4-in hex drive

• #2 Phillips screwdriver bit

Note

Install the heat sink only after the Alpha 21064A has been assembled

to the board ZIF socket.

Starting and Using the AlphaPC64 3–3