Dram Single In-Line Memory Modules (Dsimms); Dsimm Configurations - Sun Microsystems SPARCclassic Service Manual

DRAM Single In-line Memory Modules
(DSIMMs)
This section describes the procedures for removing and replacing faulty DSIMMs. To
determine the location of a faulty DSIMM, see "Determining Faulty DSIMM
Locations" on page 37.
DSIMM Configurations
The main logic board contains six DSIMM slots capable of accepting either 1-, 2-, 4-,
or 16-megabyte DSIMMs. The six DSIMM slots are logically grouped into three
memory banks, with two DSIMM slots to a bank. Each slot is labeled 1, 2, or 3 to
indicate its corresponding memory bank.
You can combine different types of DSIMMs in the same system, but you must
observe the following restriction: The two DSIMM slots within each bank must be
identically configured (that is, they should both contain the same type of DSIMM or
else both should be empty).
Figure 11–8 shows a typical DSIMM. If you are merely expanding memory, and not
repairing it, refer instead to the document supplied with your memory upgrade,
Installing SPARCclassic/SPARCclassic X/SPARCstation LX SIMMs.
Figure 11–8 Typical DSIMM
Figure 11–9 shows the DSIMM slot locations on the main logic board. Table 11–1
shows the configuration matrix for the SPARCclassic X terminal using 1-,2-,4-, and
16-megabyte memory modules. Table 11–2 shows the configuration matrix using 4-
and 16-megabyte memory modules. The maximum memory configuration is
96 megabytes using six 16-megabyte DSIMMs.
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Main Logic Board and Component Replacement