Chapter 1 Product Description 1-5
1.1.2 Memory Modules
SPARCclassic and SPARCstation LX system units come equipped with at least
16 megabytes of dynamic random access memory (DRAM), expandable to 96
megabytes. The X terminal comes with either 4 or 8 megabytes of DRAM,
expandable to 96 megabytes.
Physically, DRAM chips are grouped in single in-line memory modules (DSIMMs)
that plug into DSIMM slots located on the main logic board of the system unit (see
FIGURE 10-1 and FIGURE 10-2). The main logic board contains six DSIMM slots capable
of accepting either 1-, 2-, 4-, or 16-megabyte DSIMMs.
The maximum memory configuration is 96 megabytes using six 16-megabyte
DSIMMs. You can combine different types of DSIMMs in the same system; however,
you must add DSIMMs in identical pairs. That is, you can add a pair of 4-megabyte
DSIMMs or a pair of 16-megabyte DSIMMs, but you can’t add a single DSIMM or
add one of each type.
FIGURE 1-4 Typical DSIMM
1.1.2.1 Video SIMM
SPARCstation LX systems can accommodate an optional 1-megabyte video SIMM
(VSIMM). The VSIMM plugs into a VSIMM slot on the main logic board and allows
SPARCstation LX systems to support the following video display resolutions:
■ 1600 x 1280
■ 1280 x 1024
■ 1152 x 900 double-buffered
1.1.2.2 SBus Cards
You can add various SBus cards to the system’s two SBus slots on the main logic
board.
FIGURE 10-1 and FIGURE 10-2 show the location of the SBus slots. See the
Section 11.1 “SBus Cards” on page 11-1 for information about how to remove and
replace SBus cards.
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