1-2User’s Guide1.1 System Board LayoutThe system board has the following features and components:• Supports 3.3V Intel Pentium CPU (75/50, 90/60, 100/66, 120/60,133/66, 150/60, 166/66 MHz, 200/66 MHz)• 128-MB maximum system memory• Four 72-pin SIMM sockets that accept 4-, 8-, 16-, and 32-MBSIMMs, with or without Extended Data Output (EDO) and ErrorChecking and Correction (ECC) functions• 256-KB or 512-KB pipelined-burst second-level cache• Integrates an enhanced PCI local bus IDE controller• Onboard video and graphics controller and 1-MB VGA memory,upgradable to 2 MB• Audio controller compatible with Sound Blaster, Microsoft Sound,and MPU-401• 128-KB Flash ROM for system BIOS• One riser card slot• Dual 16C550 buffered serial ports and one ECP/EPP parallel port• USB interface that enables the system to support moreperipherals (optional)• Standard connector for Wavetable upgrade (optional)• PS/2 mouse and keyboard interface• Plug-and-Play function• Power-management function• Infrared function for cableless communication (optional)• Software shutdown circuitry (optional)Figure 1-1 shows the board layout and the locations of the importantcomponents.