For those interested in learning more about the IBM PC and its clones, Govindarajulu's book, "IBM PC and Clones," is available for download in PDF format. The book provides a detailed analysis of the IBM PC's hardware and software, as well as the clone market.
Modern x86-64 processors used in high-end gaming rigs and enterprise servers still boot up in 16-bit "Real Mode"—the exact mode utilized by the 1981 IBM PC—before switching to Protected and Long modes. Understanding Govindarajulu’s text is essential for operating system developers and low-level firmware (BIOS/UEFI) engineers. ibm pc and clones by govindarajulu pdf
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