1-10 System OverviewExternal connectors on the system board include two serial connectors, aparallel connector, two USB ports, keyboard port, mouse port, and externalaudio connectors.The system board supports a 1.44-MB diskette drive, and up to four IDE devicessuch as a hard drive or CD-ROM drive.The system board seats in the NLX connector on the riser board. The systemboard is installed in the chassis along guide rails and is secured with a singlelatch for easy access.For further information on the system board, see Section 4, “System Board.”Section 6, “Illustrated Parts Breakdown” lists the NEC CSD part number for thesystem board.Riser BoardThe riser board contains most of the cable connectors in the system, including: primary and secondary IDE connectors diskette drive connector expansion board connectors front panel connector for lamp and power signals NLX connector for the system board CD audio in, modem in, Wake-On LAN, chassis intrusion, speaker, andfan connectors external LAN connector power connectors system fan and LAN jumpers.For further information on the riser board, see Section 5, “Riser Board.”Section 6, “Illustrated Parts Breakdown” lists the NEC CSD part number for theriser board.Diskette DriveA single diskette drive is supported in the system (the BIOS does not support asecond diskette drive). The installed 1.44-MB 3 1/2-inch diskette drive isconnected by a single ribbon cable with two connectors. The diskette drive cableplugs directly into the riser board. There are no switches or jumpers that need tobe set and the diskette drive is terminated.Connector locations for the diskette drive on the riser board are given inSection 5, “Riser Board.” Section 6, “Illustrated Parts Breakdown,” lists theNEC CSD part number for the diskette drive. Diskette drive specifications aregiven in Section 10, “Specifications.”
