Dell Precision 400 Service Manual (.pdf) - Page 20
Enhanced Dual-Interface EIDE Subsystem, Audio Controller, PCI Video Card,
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Enhanced Dual-Interface EIDE Subsystem The enhanced dual-interface EIDE subsystem supports two EIDE interfaces (primary and secondary), each of which can support up to two EIDE devices. The EIDE controller resides on the high-speed PCI local bus. The primary EIDE interface (IDE1) provides support for up to two highperformance EIDE devices. The computer's boot drive should be connected to the primary EIDE interface. The secondary EIDE interface (IDE2) also provides support for up to two highperformance EIDE devices, typically EIDE tape drives or CD-ROM drives. NOTE: The externally accessible drive bays at the front of the computer are normally used for diskette drives, CD-ROM drives, and/or tape drives. Harddisk drives should be installed in the internal hard-disk drive bracket described in the previous subsection, "Hard-Disk Drive Options." For detailed information about the data storage subsystem, see Chapter 9, "Installing Drives," in the User's Guide. Audio Controller The system board has a built-in 16-bit Crystal CS4236B audio controller chip and connectors on the back panel for connecting the computer to external audio devices (such as speakers/headphones and microphone). The controller supports all the sound functions found on the Sound Blaster expansion card from Creative Laboratories, Inc. Chapter 6, "Using the Integrated Audio Controller," in the User's Guide provides instructions for connecting the computer to external audio devices and configuring the integrated audio controller to avoid resource conflicts. PCI Video Card The video subsystem consists of a high-speed, high-resolution video adapter card installed in one of the bottom two PCI expansion-card connectors (PCI1 or PCI2). Because the video adapter card connects to the 33.3-MHz PCI local bus rather than to the 8.33-MHz ISA-compatible system bus, communication between the video subsystem and the microprocessor is much faster. 1-8 Dell WorkStation 400 Systems Service Manual