Oki 6E - Manual (Page 22)

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Figure 2-4 RAM Board Block Diagram
2.3 RAM Board (OKIPAGE 6e/6ex option)
The RAM board consists of DRAM's and a SIMM socket.
(1) DRAM
1MB of DRAM's reside on the RAM board.
(2) SIMM Socket
One SIMM socket is mounted on the RAM board.
SIMM Socket Resident RAM
(1MB)