Many Indian engineering colleges (VTU, JNTU, Anna University) host scanned copies on their internal NPTEL-like servers. Try searching:
"Govindarajulu" "IBM PC and Clones" filetype:pdf ibm pc and clones by govindarajulu pdf upd
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Includes diagrams for RAM parity, wait state logic, and DMA (Direct Memory Access) . Many Indian engineering colleges (VTU
The text is widely used in academic and professional circles to understand the architecture that defined the modern PC era. It covers: wait state logic