Ricoh A250 Service Manual page 607

31 May, 1999
1.4 BLOCK DIAGRAM
S D R A M D I M M
(Option)
32MB or 64MB
S D R A M
(16MB)
C o d e R O M
(4MB Flash)
P S 3 D I M M
(Option)
8MB Flash
The controller board contains a CPU (NEC VR4310) and an ASIC (Rocky-R). The
ASIC controls the main memory (SDRAM), engine interface, ROM interface,
IEEE1284 parallel interface, two option bus interfaces for the NIB and HDD, and an
IC card interface for upgrading firmware.
There is one optional memory socket that can have either a 32MB or a 64MB
SDRAM DIMM module to increase RAM capacity and enable RAM collation. With
the 64MB SDRAM module, the RAM capacity is increased to 80MB. There is
another memory socket for the optional PS3 DIMM.
The two option bus interfaces allow the user to install an Ethernet NIB and a hard
disk drive (allows the Proof Print, Disk Collation, and font and form download
features).
The flash memory card interface allows the firmware for the controller, PostScript,
and NIB to be updated.
SM
OVERALL MACHINE INFORMATION
Controller
C P U
N E C V R 4 3 1 0
1 6 7 M H z
A S I C
Rocky-R
D A T A / A D D R E S S B U S
F o n t R O M E E P R O M
(1MB Mask) (8kB)
Ethernet NIB
10BaseT/100BaseTX
1-5
B i C U
Mother Board
Parallel I/F
Controller
IEEE1284 Port
(ECP)
Option Bus I/F
Option Bus I/F
H D D
(Option) (Option)
1 . 6 G B
Flash
M e m o r y
Card I/F
B305V502.WMF
A250