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  As the PC family has evolved, the amount and complexity of the ROM
  software has increased to accommodate the greater sophistication of the
  computer hardware. The source code listings in the PC, XT, and AT
  technical reference manuals consist of tens of thousands of
  assembly-language instructions. Despite the size of the ROM BIOS, a browse
  through the source code can be fun and enlightening.

  We have made every effort in this book to point out when and how to use
  the ROM BIOS routines. We recommend that you read Chapters 8 through 13
  before you begin your own exploration of the ROM BIOS.