Option 1: The Internet Archive (Borrow)
Option 2: Academia & Research Gate
Option 3: Used Book → DIY Scan
Searches for "IBM PC and Clones by Govindarajulu pdf upd" often lead to: ibm pc and clones by govindarajulu pdf upd
Truth: The last major print edition was 1991 (Reprint 2004) . There is no official digital edition from Tata McGraw-Hill (now McGraw Hill Education). Any “upd” is a user-scanned copy. Option 1: The Internet Archive (Borrow)
Do not waste hours on shady sites. Here is a realistic workflow: Option 2: Academia & Research Gate