Oki OKIOFFICE44 Service Manual page 278

A3.1.11 R44 Circuit Diagram
1. Block diagram
The circuit diagram 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: A 1 Mbyte (MEM-2) memory board can be added to the memory capacity for
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)
Board Descriptions
OKIOFFICE 44.
R44
AD0 to AD7
CN13
A11
B12
A20, A21
B19, B20
A19
A13, B13
5 V
A5, B5, A18,
0 V
B18
A - 36
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
OKIOFFICE 44 Serv. Man., P/N 59276801
P-SRAM
RAM1
RAM2