This chapter analyses a Pentium-based motherboard. An example board is the Intel 430HX motherboard which supports most Pentium processors and has the following component parts:
• PCIset components – 82438 System Controller (TXC) and 82371SB PCI ISA Xcelerator (PIIX3).
• 82091AA (AIP) for serial and parallel ports, and floppy disk controller.
• DRAM main memory.
• L2 cache SRAM.
• Universal serial bus (USB).
• Interface slots (typically 4 PCI and 3 ISA).
• 1 Mbit flash RAM.
Figure 5.1 illustrates the main connections of the PCIset (which are the TXC and PIIX3 devices). The TCX allows for a host-to-PCI bridge, whereas the PIIX3 device supports:
• PCI-to-ISA bridge.
• Fast IDE.
• APIC ...