Oki OKIPAGE24DX Maintenance Manual page 17

(3) DRAM's
16-Megabyte DRAM (64 Mbit DRAM x 2) is mounted as resident memory to be used for storing
the program and providing various buffers. This DRAM is expandable up to 128 Mbytes by
adding expansion memory (SIMMs). This DRAM provides the areas shown in the following
table.
Memory area
System area
Raster buffer
Receive buffer
Page buffer
DLL/macro buffer
Font cache buffer
(4) EEPROM
The EEPROM has a 16-kbit capacity and stores the following data.
• Menu data
• Various counter data (page counter, drum counter, fuser counter, etc.)
• Adjustment parameters (LED head drive time, print start position, etc.)
(5) LSI (LZ9FF22)
Built in device
Serial I/O port
Motor driver controller Control of Hopping motor
I/O port
(6) Host interface
This printer has the following interfaces to the host.
• Centronics bidirectional parallel interface
• RS232C interface
• OKI HSP interface (Option)
The single effective interface or the automatic interface select mode can be selected using
the menu. If the busy state of the printer continues for a long time period, the buffer near-
full control releases the busy status at constant intervals even if the host side is busy so not
to cause the interface time-out at the host side.
40930701TH DRAFT Vesion
Use
Working area used for the program
Stores converted bit image data
Stores temporarily the data received
from the host interface
Adds print information to the analyzed
receive data and stores the resulted
data.
Stores soft fonts and macro data.
Stores bit map fonts generated by the
font rasterizer based on scalable font
information
Function
Control of serial interface between controller and 2nd tray, 3rd tray, Multi purpose feeder
Control of serial interface between controller and Duplex unit
Inputting of various sensor signals
Outputting of various control signals
Memory capacity setting
MENU Expansion RAM
Fixed Fixed
Enable Expandable
Enable Expandable
– Expandable
– Expandable
Enable Expandable
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