Dell Precision 400 Service Manual (.pdf) - Page 18

power supply AC power receptacle security cable slot parallel port connector serial port 1 connector keyboard connector mouse connector serial port 2 connector externally accessible drive bays hard-disk drive bracket USB connectors (2) NIC connector microphone jack line-out jack line-in jack video connector padlock ring riser board expansion-card cage Figure 1-4. Internal View of the Mini Tower Computer Dual-Processor Capability With the installation of a second processor SEC cartridge in the secondary SEC cartridge connector on the system board, the computer becomes a dualprocessing system. The second processor must be the same type and frequency as the first processor. To take advantage of two processors, dual-processing systems must have multiprocessing operating systems, such as the Microsoft® Windows NT ® 4.0 operating system. Advanced Expansion Subsystem The Dell WorkStation 400 systems offer advanced expansion subsystems that can support a mixture of traditional ISA expansion cards (called legacy cards), Plug and Play ISA expansion cards, and PCI expansion cards. The operating system or the ISA Configuration Utility (ICU), included with the system, provides a means of avoiding resource conflicts that might arise from such an arrangement. 1-6 Dell WorkStation 400 Systems Service Manual