Lenovo PC 300GL Technical Information Manual 6272, 6282 - Page 24

Flash EEPROM, Riser Card

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Chapter 2. System Board Features Flash EEPROM The system board uses a flash electrically-erasable, programmable, read-only memory (EEPROM) chip to store the basic input/output system (BIOS), video BIOS, IBM logo, Configuration/Setup Utility, and Plug and Play data. If necessary, the EEPROM can be easily updated using a standalone utility program that is available on a 3.5" diskette. 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 one of two riser cards. Different riser cards provide a different configuration of PCI and ISA connectors and are representative of the different mechanical sizes. The following figure summarizes the characteristics of the two riser cards. Figure 6. Riser Card Characteristics Expansion Slots Shared ISA/PCI Dedicated ISA Dedicated PCI 2x3 Riser Card 2 0 0 4x4 Riser Card 2 1 1 For information on the connector pin assignments, see "ISA Connectors" on page 39 and "PCI Connector" on page 41. 12 Technical Information Manual

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Chapter 2.
System Board Features
Flash EEPROM
The system board uses a flash electrically-erasable, programmable, read-only memory (EEPROM) chip to
store the basic input/output system (BIOS), video BIOS, IBM logo, Configuration/Setup Utility, and Plug
and Play data.
If necessary, the EEPROM can be easily updated using a standalone utility program that is available on a
3.5" diskette.
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 one of two riser cards.
Different riser cards provide a different configuration of
PCI and ISA connectors and are representative of the different mechanical sizes.
The following figure
summarizes the characteristics of the two riser cards.
For information on the connector pin assignments, see “ISA Connectors” on page
39 and “PCI Connector”
on page
41.
Figure 6. Riser Card Characteristics
Expansion Slots
2x3 Riser Card
4x4 Riser Card
Shared ISA/PCI
2
2
Dedicated ISA
0
1
Dedicated PCI
0
1
12
Technical Information Manual