Oki B4100 - Manual (Page 428)

40055101TH Rev.4 428 /
X'tal
MOS CPU
Internal ROM
Key switch
matrix
LCD unit
LEDs
IC1
Eight LEDs
KSCAN0
to
KSCAN7
KSENS0
to
KSENS7
DB0
to
DB7
Control signals
CN9 CN1
TXD
RXD
OPECHK
PC1-N
1 1
R17 OPE (05W) for OKIFAX 5000 series.
CPU
IOGA
2 2
5 5
13 13
4 4
3 3
15 15
14 14
12 12
OPERST
PSMODE
HUP-N
RIINT
from PC1
IC2
MP/OFF
to Main power supply
(AC ON)
from NCU
Figure A3.4.1 Block Diagram of OPE (operation unit)