Technical Information 1-13
With 4 MB or 8 MB of video WRAM, the system supports the following additional
resolutions, colors, and refresh rates:
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1600 by 1200 pixels, 256/16.5K colors, vertical refresh rate of 60-78 Hz and a
horizontal refresh rate of 76-96 Kz
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1280 by 1024 pixels, 256/65K/16.7 million colors, vertical refresh rate of 60-110
Hz and a horizontal refresh rate of 63-107 Kz
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1152 by 882 pixels, 256/16.5K/16.7 million colors, vertical refresh rate of 60-120
Hz and a horizontal refresh rate of 54-110 Kz
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1024 by 768 pixels, 256/65K/16.7 million colors, vertical refresh rate of 60-120
Hz and a horizontal refresh rate of 48-104 Kz
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640 by 480 pixels, 256/65K/16.7 million colors, vertical refresh rate of 60-200 Hz
and a horizontal refresh rate of 32-100 Kz.
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.
