Memory Modules - Sun Microsystems SPARCclassic Service Manual

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
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:
4 1600 x 1280
4 1280 x 1024
4 1152 x 900 double-buffered
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 "SBus
Cards" on page 107 for information about how to remove and replace SBus cards.
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