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IBM Personal Computer AT Technical Reference

This document serves as a comprehensive technical reference for the IBM Personal Computer AT, offering detailed insights into its hardware architecture and operational capabilities.

Key Technical Areas Explored:

System Board components and logic diagrams
Coprocessor (80286/80287) specifications and interface
Power supply unit details, including inputs, outputs, and protection
Keyboard interface, scan codes, and layout variations
System BIOS functions and programming hints
I/O channel signals, connectors, and address maps
Memory organization, system timers, and clock generation

Designed for hardware engineers, programmers, and technical users, this manual provides essential information for understanding, maintaining, and developing for the IBM Personal Computer AT platform.

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