4-14 System Board the expense of replacing ROM BIOS chips is eliminated, so systemmaintenance costs are reduced there is less chance of inadvertently damaging the system board thanwhen physically replacing ROMs new technology can be incorporated while maintaining corporatestandards network administrators can exercise company-wide control of BIOSrevisions.The BIOS programs execute the Power-On Self-Test, initialize processorcontrollers, and interact with the display, diskette drive, hard drives,communication devices, and peripherals. The system BIOS also contains theSetup utility. The POST copies the ROM BIOS into RAM (shadowing) formaximum performance.The Flash ROM allows the system and video BIOS to be upgraded with theBIOS Update utility, without having to physically remove the ROM (seeSection 2 for further information on the BIOS Update utility). The Flash ROMsupports the reprogramming of the system BIOS and the video BIOS.System MemoryThe system comes with between 32 MB and 256 MB of SDRAM installed inDIMM sockets on the system board.The memory configuration consists of two sockets. The DIMM sockets accept168-pin, 64-bit (non-ECC), 16-, 32-, 64-, and 128-MB DIMMs (64-MB and128-MB as available). See “DIMM Sockets” for a list of supported DIMMs.Hardware MonitorThe National Semiconductor Heceta LM80 chip provides economicalinstrumentation capabilities for reduced cost of PC ownership when the systemis used with the LANDesk ® Client Manager. This single-chip application-specific integrated circuit (ASIC) features: integrated ambient temperature sensor power supply voltage monitoring to detect excessively high or lowvoltage levels registers for storing POST hardware test results and error codes remote reset capabilities from a remote peer or server through LANDeskClient Manager v.3.2.When ranges for temperature or voltage are exceeded, an interrupt is activated.The hardware monitor component connects to the ISA bus as an 8-bit I/Omapped device.
