Sun Microsystems SPARC classic X, Руководство по обслуживанию

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1-6 SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
FIGURE 1-5
Typical SBus Card
The following is a sampling of the SBus cards available for SPARCclassic and
SPARCstation LX systems. Note that this is not an all-inclusive list.
■
GX Graphics Accelerator Card – This card controls the video output from the
system unit, and accelerates the generation of graphic images. The GX Graphics
Accelerator card occupies one SBus slot on the main logic board. (On the
SPARCclassic X terminal, the card is supported as a factory-installed option but
not as an add-on board.)
■
Color Frame Buffer Card – This card occupies one SBus slot. This card controls the
video output from the system unit to a color monitor.
■
Second Ethernet Card – This card provides you with an extra Ethernet port. The
Ethernet card is used in applications in which your SPARCstation acts as a
gateway between two physically distinct Ethernet networks. This card has two
connectors: standard (thick) Ethernet and twisted-pair Ethernet. It occupies one
SBus slot.
■
Video Frame Capture Card – This card occupies one SBus slot. This card takes video
input and displays it on color or monochrome monitors.
■
SBus Printer Card – This card occupies one SBus slot. This card connects the
system to printing, plotting, and scanning devices.
1.1.3 Nonvolatile RAM (NVRAM)
The NVRAM chip on the main logic board contains the time-of-day clock and the
nonvolatile RAM (
FIGURE 10-1
and ). The nonvolatile RAM stores the default system
configuration parameters. These parameters define how the system is configured at
the lowest level. You can modify these parameters using the Forth Toolkit. For
additional details, see the manual Open Boot Command Reference.