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Technical Information
1-14
ISA Bus
The system board uses the ISA bus for transferring data between the processor and I/O
peripherals and expansion boards. The ISA bus supports 16-bit data transfers and typically
operates at 8 MHz. ISA expansion slot connector pin assignments are provided in
Appendix A.
PCI Local Bus
The 32-bit PCI-bus is the primary I/O bus for the system. The PCI-bus is a highly-integrated
I/O interface that offers the highest performance local bus available for the Pentium
processor. The bus supports burst modes that send large chunks of data across the bus,
allowing fast displays of high-resolution images.
The PCI-bus operates at half the Pentium's processor speed, and supports memory transfer
rates of up to 105 MB per second for reads and up to 120 MB per second for writes,
depending on processor configuration.
The high-bandwidth PCI-bus eliminates the data bottleneck found in traditional systems,
maintains maximum performance at high clock speeds, and provides a clear upgrade path to
future technologies.
The PCI bus contains two embedded PCI devices, the PCI local bus IDE interface and the
PCI video/graphics controller.
PCI expansion slot connector pin assignments are provided in Appendix A.
PCI Auto Configuration
The system comes with a PCI auto configuration utility that operates in conjunction with
the system's Setup utility. The utilities automatically configure interrupts, DMA channels,
I/O space, and other parameters to allow addition of PCI boards with minimal user
intervention. (See Section 2 for Setup information.)
PCI/IDE Ports
The system board provides two high-performance PCI/IDE ports: a primary channel and a
secondary channel. Each port supports up to two devices for a total of four IDE devices.
The primary PCI/IDE port has an enhanced IDE interface which supports 11.1 MB per
second 32-bit wide data transfers on the high-performance PCI local bus. The installed hard
disk drive is connected to the primary PCI/IDE port. The installed CD-ROM reader
(multimedia and zip drive systems only) is connected to the secondary PCI/IDE port.
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Troubleshooting
