1-12 Technical Information
Video Memory
The system comes with 1 MB of on-board video DRAM, upgradeable to 2 MB. The
standard 1 MB DRAM consists of two 256K by 16 DRAM devices soldered to the system
board. The optional 1 MB of DRAM consists of two 256 KB by 16 modules that install in
two sockets on the system board.
With the standard 1 MB of video DRAM, the video hardware supports the following
resolutions, colors, and refresh rates:
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1280 by 1024 pixels, 16 colors, 60 Hz
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1024 by 768 pixels, 16/256 colors, 60 Hz, 70 Hz, 75 Hz, and 85 Hz
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800 by 600 pixels, 16/256/64K colors, 56 Hz, 60 Hz, 72 Hz, 75 Hz, and 85 Hz
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640 by 480 pixels, 16/256/64K/16 million colors, 60 Hz, 72 Hz, 75 Hz and 85 Hz
With 2 MB of video DRAM, the system supports the following additional resolutions,
colors, and refresh rates:
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1280 by 1024 pixels, 256 colors, 60 Hz and 75 Hz
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1024 by 768 pixels, 64K/16 million colors, 60 Hz, 70 Hz, 75 Hz and 85 Hz
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800 by 600 pixels, 16 million colors, 56 Hz, 60 Hz, 72 Hz, 75 Hz, and 85 Hz
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640 by 480 pixels, 16 million colors, 60 Hz, 72 Hz, 75 Hz, and 85 Hz.
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.
