Oki B 4100 Maintenance Manual page 397

1. Block diagram
The circuit diagram shown on page 11/12 consists of the following connectors:
• Connector CN13 that provides an interface between R44 board and optional memory board.
• Connector CN11 and CN12 that provides an interface between R44 board and optional CTR
board.
Figure A3.1.13 shows the interface between R44 and memory board.
Figure A3.1.14 shows the interface between R44 and CTR (PC interface unit) board.
Note 1: One of 512 kbyte (MEM) or 1 Mbyte (MEM-2) memory board can be added to the
A3.1.12 R44 Circuit Diagram (Page 12/12)
CPU
A0 to A18
RD-N
WRL-N
PCS1-N to PCS4-N
IC2
PSREAD-N
IOGA
Figure A3.1.13 Interface between R44 Board and Memory Board (option)
40055101TH Rev.4
memory capacity for OKIOFFICE 44/OKIFAX 4100.
R44
AD0 to AD7
CN13
A11
B12
A20, A21
B19, B20
A19
A13, B13
5 V
A5, B5, A18,
0 V
B18
MEM/MEM-2 (option)
AD0 to AD7
CN
A0 to A18
RD-N
WRL-N
PCS1-N to PCS4-N
PSREAD-N
5 V
0 V
P-SRAM
RAM1
RAM2
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