Specifications

17 January 1997 – Subject to Change
Upgrading the AlphaPC 164 5–3
Increasing Microprocessor Speed
To widen the memory bus to its 256-bit maximum (upgrade option 2), add four
SIMMs and make a jumper change (remove J1). The SIMMs that you add must be of
the same size (nMb X 36-bit) and have an access time equal to or less than the four
SIMMs already in the system. Refer to Figure 2–1 for SIMM connector and jumper
location.
To upgrade DRAM memory, perform the following steps:
1. Observe antistatic precautions. Handle SIMMs only at the edges to prevent
damage.
2. Remove power from the system.
3. Hold the SIMM at an angle with the notch facing the key in the socket.
4. Firmly push the module into the connector and stand the module upright. Ensure
that the SIMM snaps into the metal locking clips on both ends.
5. For 128-bit memory bus width, jumper J1 must be in. For 256-bit memory bus
width, jumper J1 must be out.
6. Restore power to the system.
5.3 Increasing Microprocessor Speed
To increase microprocessor speed, the following must be done:
•
Replace the Digital Semiconductor 21164 microprocessor with an Alpha chip
that has a higher speed rating.
•
Replace the microprocessor clock oscillator.
•
Reconfigure the clock divisor jumpers.
5.3.1 Preparatory Information
Caution:
Static-Sensitive Component – Due to the sensitive nature of electronic
components to static electricity, anyone handling the microprocessor
must wear a properly grounded antistatic wriststrap. Use of antistatic
mats, ESD approved workstations, or exercising other good ESD prac-
tices is recommended.
A Digital Semiconductor 21164 microprocessor with a higher speed rating is
available from your local distributor. For the name of the distributor nearest you, call
the Digital Semiconductor Information Line (refer to Appendix F).