System Board 4-11PCI/IDE PortThe system board supports high-performance primary and secondary PCI/IDEports on the system board. The primary PCI/IDE port has an enhanced IDEinterface that supports a PIO Mode 4 device with 16 MB per second 32-bit widedata transfers on the high-performance PCI local bus. The port supports UltraDMA/33.The installed hard drive is connected to the primary PCI/IDE port connectorwith a signal and power interface cable. The installed CD-ROM drive isconnected to the secondary PCI/IDE port connector with a signal and powerinterface cable.Parallel InterfaceThe system has a 25-pin bidirectional parallel port on the system board. Portspecifications conform to the IBM-PC standards. The port supports EnhancedCapabilities Port (ECP) and Enhanced Parallel Port (EPP) modes for devicesthat require ECP or EPP protocols. The protocols allow high-speed bi-directional transfer over a parallel port and increase parallel port functionalityby supporting more devices.The BIOS has automatic ISA printer port sensing that works with most devices.If the BIOS detects an ISA printer port mapped to the same address, the built-inprinter port is disabled. (Verify in the BIOS Setup that printer ports mapped tothe same address are enabled or disabled appropriately.) The BIOS also sets thefirst parallel interface port it finds as LPT1 and the second port it finds as LPT2.The interrupt is set at IRQ7 via the BIOS Setup utility. Software-selectable baseaddresses are 228h, 378h, and 278h.Sets of I/O addresses for the parallel port are given in the following table (seeSection 2, “System Configuration,” for interrupt levels). This is a list of allpossible configurations. The parallel port uses only one set.Parallel Port AddressesStarting I/O Address Port378 LPT1278 LPT2228 LPT3378 LPT1278 LPT2228 LPT3Parallel interface signals are output through the system board’s 25-pin,D-subconnector. The connector is located at the back of the system unit.
