Abstract
Together, disk operating system (DOS) and the read-only memory basic I/O system (ROM BIOS) perform all of the operating system functions necessary to support the personal computer (PC), such as managing directories and files, displaying text and graphics, and loading and executing programs. They also perform tasks that one might not be aware of, such as determining the type of equipment installed in a PC or formatting a hard disk. The ROM BIOS houses all of the low-level routines for controlling I/O operations. The DOS routines, on the other hand, operate at a higher level than the ROM BIOS routines. Some of the DOS routines make calls to the ROM BIOS. Thus, if one is concerned about the performance of a program that one is writing, one should use the ROM BIOS directly. QuickC provides a complete set of built-in functions for accessing both DOS and the ROM BIOS. The chapter presents most of the major functions that are available. These functions are divided up into three main categories: general DOS interrupt calls, BIOS interrupt calls, and general interrupt calls which allow to access either DOS or the ROM BIOS.
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