Abstract: An interface circuit for an IDE-type CD-ROM drive connected to a personal computer using a standard IDE interface according to a hard disk drive interface standard includes a drive selecting circuit for generating a buffer gate signal a control circuit for generating a command signal, a drive read signal, a drive write signal and a drive reset signal responsive to an IDE port address, an input/output read signal, an input/output write signal and a reset signal, for providing the received signal to the IDE interface by receiving handshake signals, a data buffer for transmitting the data in a specified direction determined according to the drive read signal, and a master-slave communication circuit for generating communication signals in response to a reset signal from the IDE interface.