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Undocumented DOS - Programmer's Guide to Reserved MS-DOS Functions and Data Structures, Andrew Schulman et al.

Undocumented DOS - A Programmer's Guide to Reserved MS-DOS Functions and Data Structures , by Andrew Schulman , David Maxey, Jim Kyle, Ralph Brown, Raymond J. Michels, Tim Paterson What You Will Find in This Book Most programmers who have worked with a DOS technical reference have probably wondered at some time or other about its curious "holes": function numbers that are marked "Reserved" or even entirely missing. This book contains a detailed version-by-version explanation of these "missing" DOS functions. In addition, the book emphasizes the crucial undocumented DOS data structures , such as Memory Control Blocks (MCBs), the Current Directory Structure (CDS), Swappable Data Area (SDA), and the List of Lists. It also details the undocumented fields in structures that are otherwise documented, including the Program Segment Prefix (PSP), File Control Block (FCB), Drive Parameter Block (DPB), BIOS Parameter Block (BPB), and so on. For any of this to be usable in real programs, you should pay careful attention to our descriptions of how the layout of these structures differs from one DOS version to the next. But more than simply listing the undocumented functions and data structures,

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