Sun Microsystems 220R service manual Standard System Facilities, Main Logic Board

C.1.16 Standard System Facilities

In addition to the previously listed features, the system unit provides the following:

4TOD/NVRAM for clock and identification functions

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.

Functional Description 277