Oki ML390 Service Manual page 37

Line Feed Microstep Control
Controls incremental stepping of the line feed motor.
Memory Interface
This expands the memory space for ROMs and RAMs connected to this LSI. Up to 368 kbytes of memory
may be accessed.
Dynamic RAM (D-RAM) Refresh
CAS is used to refresh the D-RAMs before the RAS refresh method is used.
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