HP 3150 manual Formatter system, Central processing unit, Memory, Read-only memory ROM

Formatter system

The formatter is responsible for the following:

●controlling the document scanner

●formatting and controlling faxes

●formatting and controlling copies

●receiving and processing print data from the printer interface

●monitoring the control panel and relaying printer status information

●developing and coordinating data placement and timing with the print engine

●communicating with the host computer through the bidirectional interface

The formatter receives print data from the bidirectional ECP interface and converts it into a dot image. The ECU synchronizes the image formation system with the paper feed system and signals the formatter to send the print image data. The formatter sends the print image data (dots) in the form of a video signal and the printing process begins.

Central processing unit

The formatter incorporates a Motorola 68030 custom microprocessor operating at 25.2 megahertz (MHz).

Memory

Memory can be cleared by removing the formatter board. For information about removing the formatter board, see Chapter 5, “Removal and replacement.”

Read-only memory (ROM)

●Flash ROM stores the microprocessor control program.

●Masked ROM, also known as Boot ROM, stores startup sequences, commands, and the demo page.

72 Functional overview EN