Cmos Battery; Bridge Battery; System Memory - NEC VERSA 6000 Series Service Manual

1-16 Technical Information

CMOS Battery

The lithium battery (3.0 Volts, 280 mAh capacity) is attached to P13 on the CPU board. It provides battery backup and
prevents data loss in the system's complementary metal oxide semiconductor (CMOS) RAM. This memory area contains
information on the system's configuration like date, time, drives, and memory. The CMOS battery lasts approximately two
years.

Bridge Battery

The bridge battery saves the memory contents and system status for up to 5 minutes while in Suspend mode. It is
connected to the CPU board via connector P15. The AC adapter maintains voltage in the bridge battery when the system
is powered on or off. The bridge battery provides 6 Volts, 60 mAH.

System Memory

The system board provides 16-MB of standard random access memory (RAM).
Optional memory boards with a value of 8-, 16-, 32- or 64MB can be added to increase system memory up to a maximum
of 80-MB (70 ns Fast Page access). In addition, 256 KB of read-only memory (ROM), 1 x 28F020, enables the system
BIOS to be flashed.
The system provides 2 MB of video RAM (60 ns HyperPage mode, self-refresh).
Cache RAM is available with L1 write-back access support providing 8 KB for code, 8 KB for data. L2 write-back access
support providing 256 KB.