IBM PC 300PL Flash Eeprom, Expansion adapters, Physical layout, System board features Real-time

Chapter 2. System board features

Real-time		clock	and	CMOS
The	real-time		clock is a low-power clock that provides a						time-of-day clock and a calenda
settings		are	maintained		by	an	external battery	source	of 3	V	dc.
The	system uses			242	bytes		of complementary metal-oxide		semiconductor (CMOS) memory to st
The	CMOS	memory	is	erased		if	the jumper on the	system	board	is	moved.

To locate the battery, see “System board, Types 6584 and 6594” on page 13.

Flash EEPROM

The system board uses 4 Megabits (Mb) of flash electrically erasable, programmable, re (EEPROM) to store the basic input/output system (BIOS), video BIOS, IBM logo, Configurati Utility, and Plug and Play data.

If necessary, the EEPROM can be easily updated using a stand-alone utility program tha 3.5-inch diskette.

Expansion adapters

Each PCI-expansion connector is a		32-bit slot. PCI-expansion connectors support		the 32-bit
local-bus signalling environment that		is PCIdefinedLocal inBus Specification.	2.1
The	PC 300PL Personal Computer has	four PCI slots to support the	addition of	adapters. Fo
on	installing adapters,PC 300PLsee User	Guide.

For information on the connector pin assignments, see “PCI connectors” on page 27.

Physical layout

The system board might look slightly different from the one shown.

Note: A	diagram of the	system board, including switch and jumper settings, is attached
of	the computer	cover.

12 Technical Information Manual