4-10 System BoardThe FLASH ROM allows the system and video BIOS to be upgraded with the BIOS UpdateUtility, without having to physically remove the ROM (see Section 2 for further information onthe BIOS Update Utility). The FLASH ROM supports the reprogramming of the system BIOSand the video BIOS.System MemoryThe system comes with between 64 MB and 512 MB of RDRAM installed in two RIMMsockets on the system board.The RIMM sockets accept 184-pin, 64-, 128-, and 256-MB RIMMs. See the “Sample RIMMMemory Upgrade Paths” earlier in this section for a list of supported RIMMs.Plug and PlayThe system comes with a plug and play BIOS in support of plug and play technology. Plug andplay simplifies setup procedures for installing plug and play expansion boards. With plug andplay, adding a plug and play expansion board is done by turning off the system, installing theboard, and turning on the system. There are no jumpers to set and no system resource conflictsto resolve. Plug and play automatically configures the board. (Some plug and play devices mightneed to be jumpered if used in a system running the Windows NT operating system.PCI/IDE PortsThe system board has two high-performance PCI/IDE ports: a primary port and a secondaryport. The primary PCI/IDE port has an enhanced IDE interface that supports PIO Mode 4devices with 66 MB per second maximum burst rate data transfers on the high-performanceUltra DMA bus. The primary port supports Ultra DMA/66.The installed hard drive is connected as a master device on the primary PCI/IDE port. Theinstalled CD-ROM drive or DVD-ROM drive is connected to the secondary PCI/IDE port as amaster device. The hard drive is connected to the primary port with a three-connector UltraDMA/66 40-pin, 80-conductor cable. The CD-ROM or DVD-ROM is connected to thesecondary port with a standard three-connector IDE cable.Parallel InterfaceThe system has a 25-pin bidirectional parallel port on the system board. Port specificationsconform to the IBM-PC standards. The port supports Enhanced Capabilities Port (ECP) andEnhanced Parallel Port (EPP) modes for devices that require ECP or EPP protocols. Theprotocols allow high-speed bi-directional transfer over a parallel port and increase parallel portfunctionality by supporting more devices.The BIOS has automatic ISA printer port sensing that works with most devices. If the BIOSdetects an ISA printer port mapped to the same address, the built-in printer port is disabled.(Verify in the BIOS Setup that printer ports mapped to the same address are enabled or disabledappropriately.) The BIOS also sets the first parallel interface port it finds as LPT1 and thesecond port it finds as LPT2. The interrupt is set at IRQ7 via the BIOS Setup Utility. Software-selectable base addresses are 378h, 278h, and 3BCh.Sets of I/O addresses for the parallel port are given in the following table (see Section 2,“System Configuration,” for interrupt levels). This is a list of all possible configurations; theparallel port uses only one set.
