Intel
®
440Bx Scalable Performance Board Development Kit Manual 23
Theory of Operation
3.2.6 Power
The evaluation board uses an industry standard ATX-style power supply with a 20-pin connector. A
230-watt (minimum) supply is recommended. Note that the ATX power connector is keyed to
prevent incorrect insertion. See “ATX Power Connector” on page 29 for a detailed description of
the power connector.
Make sure that the ATX power supply is not plugged into the wall when connecting or
disconnecting it from the evaluation board.
3.2.7 Power Management
Some hardware in the kit may support power management, but the Intel
®
440BX Scalable
Performance Board Development Kit as a whole does not support power management. Also
note that power management has not been tested on the kit.
3.2.8 Boot ROM
The system boot ROM installed at U11 is a 2-Mbit (28F002BC) or 4-Mbit (E28F004B5T60) flash
device. The system is set up for in-circuit reprogramming of the BIOS, but the flash device is also
socketed. This device is addressable on the XD bus extension of the ISA bus.
3.2.9 RTC/NVRAM
The RTC and NVRAM are contained within the 82371EB PIIX4E device. CMOS NVRAM
backup is provided by a 3-V lithium-ion battery.
3.2.10 Legacy I/O
Support for legacy I/O functions is provided by the Intel 82371EB PIIX4E and the SMC
FDC37B787 SuperI/O* device.
3.2.11 IDE Support
The evaluation board supports both a primary and secondary IDE interface via two 40-pin IDE
connectors. The connector labeled IDE1 is the primary interface. IDE2 is the secondary interface.
3.2.12 Floppy Disk Support
Floppy disk support is provided by the SMC FDC37B787 SuperI/O device. One 34-pin floppy
connector is provided on the evaluation board.
3.2.13 Keyboard/Mouse
Keyboard and mouse support are provided by the SMC FDC37B787 SuperI/O device. The
keyboard and mouse connectors (J1) are PS/2-style, 6-pin stacked miniature DIN connectors. The
top connector is for the keyboard and the bottom connector is for the mouse.
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