Eagle 450 Upgrade Instructions, Rev. A00
Chapter 3 - Upgrading Eagle 450
On-Board Memory
The AM-138 has two on-board SIMM (single inline memory module) expansion slots, which support
60ns DRAMs. Because the memory is located on-board, it can be accessed much faster than memory
accessed over the VME bus—i.e., AM-730 and AM-740 memory boards used with earlier CPU boards.
The AM-138 also supports one 64KB cache SIMM (the AM-701). This SIMM is installed in the same
way as the memory SIMMs.
The following procedures describe how to install and remove the memory and cache SIMMs, and set the
memory size jumpers. They are referred to in the appropriate place in the upgrade instructions in
Chapters 6, 7, and 8. Do not attempt install any SIMM until you reach the appropriate place in the
installation procedure for your configuration.
ELECTRONIC EQUIPMENT HANDLING PRECAUTIONS
While your computer's hardware is exposed and the AC power cord is unplugged, the
components are vulnerable to damage caused by static discharge. Your body and clothing are
capable of storing an electrical charge that can damage or destroy unprotected electronic
components. Before you handle any computer hardware, make certain your work area is properly
protected against static discharge. There are a number of commercially available static protection
devices, like the wrist strap shown below, designed specifically to protect your equipment from
harmful static discharge.
Figure 3-1: ESD Wrist Strap
