Sun Microsystems SPARCclassic Service Manual page 119

Visually identify each CRU by looking at the appropriate system board layout
illustration from Figure 10–1, Figure 10–2, or Figure 10–3, and by looking at the unit
bottom illustration in Figure 10–4. Table 10–2 lists acronyms and abbreviations for
certain components of the MLB.
Acronyms for Components of the Main Logic Board
TABLE 10–2
Acronym/Abbreviation
NVRAM
PROM
PTC
DRAM
DSIMM
VSIMM
AUI
LED
ISDN
The SPARCclassic/SPARCclassic X/SPARCstation LX system board CRUs are listed
below.
Unit bottom
4 DSIMMs
4 VSIMM
4 SBus cards
4 Speaker/power LED assembly
4 Main logic board
4 NVRAM
4 System I/O board
Internal cables
4 Diskette drive data cable (Not applicable to SPARCclassic X terminal)
4 Hard disk drive data cable (Not applicable to SPARCclassic X terminal)
Full Expression
Nonvolatile Random Access Memory
Programmable Read-Only Memory
Positive Temperature Coefficient
Dynamic Random Access Memory
Dynamic Single In-line Memory Module
Video Single In-line Memory Module
Attachment Unit Interface (Ethernet adapter cable)
Light-Emitting Diode
Integrated Services Digital Network
105
System Board Overview