Chapter 2. System-Board Features
Flash EEPROM
The system board uses an 8 Mb flash electrically-erasable, programmable, read-only memory (EEPROM)
to store system programs that include basic input/output system (BIOS), IBM logo, Configuration/Setup
Utility, and Plug and Play data.
As part of the continuing work to improve quality, IBM might make changes and enhancements to the
system programs. When updates are released, they will be available on the World Wide Web at
http://www.pc.ibm.com/us/intellistation
or through the PC Company Bulletin Board Service in files that can be downloaded onto a diskette.
Instructions for using the system programs updates will be available in a README file included in the
downloaded files.
Riser Card
The system board uses a riser card to route PCI and ISA bus signals to the expansion connectors. Each
ISA-expansion connector is 16 bits, and each PCI-expansion connector is 32 bits. PCI-expansion
connectors support the 32 bit, 5 V dc, local-bus signalling environment that is defined in
PCI Local Bus
Specification 2.1. The ISA bus is buffered to provide sufficient drive for the ISA-expansion connectors,
assuming two low-power Schottky (LS) loads per slot.
The system board uses a riser card. The following figure summarizes the characteristics of the two riser
card.
* Indicates full size adapter slots.
For information on the connector pin assignments, see “ISA Connectors” on page 52 and “PCI
Connectors” on page 53.
Figure 4. Riser Card Characteristics
Expansion Slots
4x4 Riser Card
Shared ISA/PCI
1*
Dedicated ISA
1*
Dedicated PCI
2
Chapter 2. System Board Features
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