| Feature | Hall (2nd Ed) | Ramesh Gaonkar | Barry Brey | | :--- | :--- | :--- | :--- | | Focus | 8085 & basic 8086 | 8085 only | 8086/8088 & Pentium | | Interfacing Depth | Excellent (8255, 8259, 8253) | Good | Moderate | | Programming Style | Assembly (hand-coded) | Assembly | Assembly & C | | Availability of Legal PDF | Low (out of print) | Moderate | High (via publisher) | | Best for | 3rd semester basics | Beginners | Advanced/Modern |
If you cannot find Hall, Ramesh Gaonkar’s "Microprocessor Architecture, Programming, and Applications with the 8085" is the best legal alternative and is often available for free via university libraries.
Most engineering colleges subscribe to platforms like McGraw-Hill Access Engineering, EBSCO, or local digital repositories. Log into your library portal and search for the ISBN. The official e-book version is often available for download as a PDF chapter-by-chapter.
Start with the 8085 architecture (Chapters 1-4). Understand the pin diagram and flag registers.