CPU Modules with Pentium® Processors

This document is a guide from Digital Equipment Corporation, published in March 1996, for installing and upgrading CPU modules equipped with Pentium® processors. It is intended for users responsible for handling CPU chips, modules, internal cables, and updating system BIOS software.

The CPU modules discussed feature Pentium processors operating at 90 MHz or higher, include a secondary cache module, and may offer a second zero-insertion force (ZIF) socket for dual-processor technology (though upgrading single-processor systems to dual-processor systems is not supported).

The guide provides instructions for:

• Powering down the computer and safely removing the CPU module.
• Identifying different CPU models and their corresponding frequencies (e.g., 590, 5100, 5120, 5133, 5150, 5166) based on bus speed, core/bus ratio, and CPU speed.
• Configuring CPU module jumper settings.
• Installing the new CPU module.

Furthermore, it offers detailed device mapping information crucial for system configuration and troubleshooting, including:

• CPU memory address maps (full range and PC compatibility range).
• CPU I/O address maps.
• Computer interrupt levels (IRQs).
• DMA channel assignments.
• PCI configuration space address maps.

The document emphasizes important safety warnings, such as disconnecting power before working inside the computer, using antistatic precautions to prevent damage, and notes that unauthorized modifications may void the user's authority to operate the equipment, especially concerning FCC compliance.