164 SPARCstation 20 Service Manual • July 1996
â– Slot J0304 is reserved for the single factory-installed VSIMM with the SX graphics
option. If no VSIMM is present, the slot may be used for a DSIMM.
â– Slot J0305 may be used for a DSIMM, VSIMM, or NVSIMM.
Note – Slot J0201 must be used for the first 64-Mbyte DSIMM when installing a
combination of 64-Mbyte, 32-Mbyte, and 16-Mbyte DSIMMs. If a 16-Mbyte or 32-
Mbyte DSIMM is previously installed in slot J0201, it must be removed from slot
J0201 and installed in another unused DSIMM slot.
Caution – The NVSIMM is specifically designed to operate in the SPARCstation 20
system. Do not remove a NVSIMM from a different Sun system and install it in a
SPARCstation 20 system. The SPARCstation 20 NVSIMM can only be used on
systems executing the Solaris 2.3 (SunOS 5.3) operating environment (or later) and
PrestoserveTM 2.4.1 or later. The SPARCstation 20 VSIMM can only be used on
systems executing the Solaris 2.3 (SunOS 5.3) or later operating environment.
2. Remove the SIMM from the protective packaging and place it on an antistatic
surface.
3. Hold the SIMM edges and insert it into the SIMM plastic guides.
4. If installing a DSIMM, position the DSIMM with the key notch near the ejection
lever (
FIGURE 11-27).
FIGURE 11-27 DSIMM, Back View
5. If installing a VSIMM, position the VSIMM with the plastic cover facing the
system unit front panel. The notched portion of the VSIMM should be near the
center of the system board (
FIGURE 11-28).
Key notch
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