I had seen this book listed in the back of one of my MS-DOS books, and my employer happened to have a copy of it. I took it home for the weekend and was blown away. I IMMEDIATELY bought a copy. This is much more than your average book on interrupts. He goes into some serious detail. You want to know a HUGE list of interrupts and how to use them? Need the pinouts for a PS/2 power supply? How about the pinouts with a description of EACH PIN for the 8086 up to 80486 CPU's and co-processors? It's all in here. Exhaustive list of tables, pinouts, little known secrets, listing of ROM BIOS functions, all the referencing to it, and MUCH more. This is one COMPREHENSIVE book. It was written at the time of DOS 5 and Windows 3.0, so remember, it's not new (1991), however, a HUGE amount of information still applies. Anywhere from the XT to 486, from MDA to VGA, from hard disk tables to EMS, and from expansion slot pin outs to card sizes, this book has it all. He has taken the technical information from DOZENS of books and included it in one large volume.