Oki OKIPAGE 24DX Service Manual page 26

Memory area
System area Working area used for the program
Raster buffer Stores converted bit image data
Receive buffer Stores temporarily the data
received from the host interface
Page buffer Adds print information to the
analyzed receive data and stored
the resulted data.
DLL/macro Stores soft fonts and macro data.
buffer
Font cache Stores bit map fonts generated by
buffer the font rasterizer based on
scalable font information.
(4) EEPROM
EEPROM has a 16-kbit capacity and stores the following data.
l
Menu data
l
Various counter data (page counter, drum counter, fuser counter, etc.)
l Adjustment parameters (LED head drive time, print start position, etc.)
(5) LSI (LZ9FF22)
Built in device
Serial I/O port
Motor drive controler Control of Hopping motor
I/O Port
(6) Host interface
This printer has the following interfaces to the host.
l Centronics bidirectional parallel interface
l RS232C interface
l 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.
(a) Centronics bidirectional parallel interface
This is an interface conforming to IEEE-1284 and provides either of unidirectional and bidirectional
communications according to each of the following communication modes.
l Compatibility mode
Unidirectional communications from the host to the printer.
l Nibble mode
Use
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 if various control signals
Memory capacity setting
MENU Expansion RAM
Fixed Fixed
Enable Expandable
Enable Expandable
---- Expandable
---- Expandable
Enable Expandable