IBM 6266/6270/6276/6279/6280/6286 Personal Computer User Manual

About this manual

This guide covers safety information, installation steps, and power‑connection requirements for the IBM Personal Computer series. It explains how to connect the three‑prong power cord to a properly grounded outlet and outlines precautions to avoid electrical shock.

The manual also details entering the BIOS Setup utility, configuring hardware components, adding or removing adapter cards and drives, and diagnosing common hardware and software problems. Appendices provide specification tables, modem information, and monitor terminology.

What's inside

• Safety information
• Installation
• Getting Started
• BIOS Setup
• Adding and removing adapter cards
• Replacing system battery
• Diagnosing and recovering from problems
• Appendix A. Specification tables
• Appendix B. Modem information
• Appendix C. Monitor terminology

Frequently asked questions

How should the IBM PC be connected to a grounded outlet?

Connect the computer to a properly grounded electrical outlet using the three‑prong power cord.

What must be done before removing cables from the computer?

Unplug the power cords from the outlet before removing any other cables.

Where can you find troubleshooting information for hardware problems?

The manual includes a "Diagnosing and recovering from problems" section with hardware troubleshooting steps.