Chapter 11 System Board and Component Replacement 161
FIGURE 11-23 VSIMM, Back View
NVSIMM
Each NVSIMM contains 2 Mbytes of memory, a battery, and power controller
circuitry to ensure memory is not lost when the system is shut down or halts
because of abnormal conditions. The NVSIMM is a card with a round, non-
replaceable battery mounted on one side. The NVSIMM plugs into a memory slot
located on the system board.
FIGURE 11-25 shows the battery side of the NVSIMM.
FIGURE 11-24 NVSIMM, Battery Side
Removing a SIMM
Refer to FIGURE 11-25 and proceed as follows:
Caution – The installed SIMMs are specifically designed to operate in the
SPARCstation 20 system. Do not remove DSIMMs, VSIMMs, or NVSIMMs from
different Sun systems and install them in a SPARCstation 20 system.
Battery
Key notches
Jumper
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