HP 1300 Service Manual - Page 55

Formatter system The formatter is responsible for the following: z receiving and processing print data from the printer interface z monitoring the control panel and relaying printer status information z developing and coordinating data placement and timing with the print engine z communicating with the host computer through the bidirectional interface The formatter receives print data from the parallel interface, the Lowcost Input/Output (LIO) interface (supports an HP Jetdirect print server or a Bluetooth wireless adaptor), or the Universal Serial Bus (USB) 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 an embedded Coldfire V3 microprocessor operating at 132 MHz. RAM z One bank of Non-Volatile RAM (NVRAM) stores parameters. z Dynamic random access memory (DRAM) provides temporary storage of print data. Parallel, LIO, or USB interface The formatter receives incoming data through its bidirectional parallel, LIO, or USB interface. This interface provides high-speed, two-way communication between the printer and the host, allowing you to change printer settings and monitor printer status from the host computer. ENWW Formatter system 55