C.1.16 Standard System Facilities; C.1.17 Main Logic Board - Sun Microsystems Enterprise 220R Service Manual

C.1.16 Standard System Facilities
In addition to the previously listed features, the system unit provides the following:
4 TOD/NVRAM for clock and identification functions
4 Flash PROM for operating system initialization. The flash PROM is
re-programmable through UNIX and OBP utilities.
C.1.17 Main Logic Board
The following figure illustrates a block diagram of the system's main logic board.
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Functional Description