Oki OKIPAGE 10ex Maintenance Manual page 228

3.14 Memory Expansion Option Board
A2 to A23
D0 to D31
CAS0 to
CAS3
RAS2 to
RAS4
ORE, RD,
WR
CS3, EEPCS, EEPCLK
EEPDAT
IOS1
The Memory Expansion Option Board is provided with two DRAM chips and two SIMM slots.
The SIMM1 slot is used for installation of a DRAM SIMM.
The SIMM2 slot is used for installation of Flash SIMM.
With the Board, a printer will have 3M bytes of Memory even without any additional DRAM SIMM
memory on the SIMM1 slot because 1M DRAM is mounted on the board.
(1) DRAM
Two 4M bits DRAMs are installed. Memory capacity totals 1M byte.
(2) SIMM Memory Module
The board is provided with two Slots for a 72-pin DRAM SIMM Memory Module and Flash
SIMM.
The SIMM1 slot is used for installation of a 72-pin DRAM SIMM Memory Module. Up to 6
types of SIMM Memory Module can be installed.
1M byte, 2M bytes, 4M bytes, 8M bytes, 16M bytes and 32M bytes. 4 types of access speed
can be used. 60, 70, 80 and 100n sec.
The SIMM2 slot is used for installation of a Flash SIMM.
The Flash SIMM is a Flash ROM Memory Module.
40990901TH Rev.1
RAS2
ORE
WR
Memory Expansion Board Block Diagram (Option)
PD2, 3
BSY
RAS3, 4 RD
WR WR
31 /