Ricoh M0A0, Service Manual

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5.Detailed Section Descriptions
117
Boards
FCU
The FCU (Facsimile Control Unit) controls fax communications, the video interface to the base copier’s engine, and all
the fax options.
FACE3.5 (Fax Application Control Engine)

CPU

Data compression and reconstruction (DCR)

DMA control

Clock generation

DRAM backup control
Modem (FAME2)
V.34, V33, V17, V.29, V.27ter, V.21, and V.8
DRAM
The 16 MB of DRAM is shared as follows.

SAF memory: 4MB

Working memory: 4MB

Page memory: 4MB

The SAF memory is backed up by a rechargeable battery.
SAF Memory Back-up
A rechargeable battery backs up the SAF memory (DRAM) for 12 hours.