Selecting a CD-ROM apparatus connected in cascade with a hard disk by a CD-ROM driver switching a drive selection bit in an IDE interface

摘要

This invention is provided to simplify building a personal computer having a CD-ROM apparatus as an external memory and using an IDE-BUS I/F for connecting to the CD-ROM apparatus. Thus, a hard disk unit is connected to a master partition of the IDE-BUS I/F of the personal computer, and the CD-ROM apparatus is connected to a slave partition of the IDE-BUS I/F.