A CD-ROM apparatus is provided with an IDE-BUS interface and an ISA-BUS interface and a switching circuit for switching there between. In another embodiment 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...http://www.google.de/patents/US6769042?utm_source=gb-gplus-sharePatent US6769042 - Selectively coupling one of two interfaces in an external memory apparatus to a personal computer depending upon a configuration of the computer and a single bus interface
