Oki OKIPAGE 10ex Troubleshooting Manual page 9

CPU
CS0
CS2
CS3 Option board
CS4
RAS0
RAS1
RAS2
RAS3
RAS4
RAS5
CAS0
CAS1
CAS2
CAS3
CAS0, 1, 2, 3 RD/WR
40990901TH Rev.1
A00 to A25
CAS0, 1, 2, 3
RAS2, 3, 4, 5
RAS2 WR
CAS0,1,2,3
RAS3, 4 WR
CAS0,1,2,3
CS3, RD/WR
Figure 3-4 Block Diagram of CPU & Memory Circuit
D00 to D32
CS0
IC2, IC3
Mask ROM
(1.5M x 16 bits)
2 pieces
RD
<Program>
IC4, IC5, IC6, IC7
RAS0
DRAM
(512 k x 8 bits)
4 pieces
RD/WR
DRAM
1M Byte
(Memory Expansion Board only)
SIMM 1
DRAM SIMM
SIMM 2
Flash SIMM
Main
control
board
Option
board
9 /