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The PCI bus provides:
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32- and 64-bit memory addressing
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+5 V and + 3 V signalling environments
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Burst transfers at 133 Mbytes per second
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8-, 16-, or 32-bit data transfers
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Plug-and-play configuration
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PeerBus to maximize throughput
Video Controller
The on-board, integrated Cirrus Logic CL-GD5424 super VGA controller
is fully compatible with video standards CGA, EGA, Hercules Graphics,
MDA, and VGA. The standard system configuration comes with 512 KB
of on-board video memory allowing pixel resolutions of 640 x 480 and
800 x 600 in 256 colors, and 1024 x 768 x 16 colors. The SVGA
controller supports only analog monitors (single and multiple frequency,
interlaced and noninterlaced) with a maximum vertical retrace interlaced
frequency of 87 Hz.
By increasing the buffer size of the onboard video memory from 512 KB
to 1 Mbyte (with one, 40-pin 256 K x 16, 70 ns fast-page DRAM), the
controller can support 132-column text modes and high resolution
graphics with 1280 x 1024 x 16 colors. Depending on the environment,
the controller displays up to 64,000 colours in some video resolutions. It
also provides hardware accelerated bit block transfers (BITBLT) of data.
On-Board SCSI Controller
The system board includes two Adaptec AIC-7870 wide/fast SCSI-2
controller chips, channels A and B, integrated as PCI bus masters. These
controllers support data path widths of 8-bit (narrow SCSI) at a data
transfer rate of 10 Mbytes/sec and 16-bit (wide SCSI) at a data transfer
rate of 20 Mbytes/sec. As PCI bus masters, these controllers support data
transfer rates of 133 Mbytes/sec.
You can connect up to seven 8-bit narrow SCSI devices or up to fifteen
8-bit narrow and/or 16-bit wide SCSI devices and one controller
(maximum of seven 8-bit narrow devices) to each channel. For example,
tape drives, printers, optical media drives, and other devices.
The SCSI controller provides active negation outputs, controls for
external differential transceivers, a disk activity output, and a SCSI
terminator power-down control.
Active negation outputs reduce the chance of data errors by actively
driving both polarities of the SCSI bus and avoiding indeterminate
voltage levels and common-mode noise on long cable runs. The SCSI
T e c h n i c a l I n f o r m a t i o n
OWNER'S HANDBOOK 5-9
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