Page: 13Service Guide OL400Chapter 2 Principles of Operation2.2 MAIN CONTROL FUNCTION2.2.01 General InformationThe main control function controls the reception of data from the host interface, processescommand signals, processes the image signals, controls the printer unit, outputs data, andcontrols the operation panel.The main control function consists of the items listed below.CPU 80186-8Font ROM (512 kbytes)Page buffer (512 kbytes)DRAM controller chip (MSM73V007)Print controller chip (MSM75HJ014)Font controller chip (MSM60791)Programmable I/O (82C55A-2GS)Interface ControlCentronics Parallel Interface BoardRS-232C Serial Interface BoardOptional Font CardOptional RAMCopyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA BusinessPartner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
