HP 1100AHP - Manual (Page 50)

48 Functional Overview C4224-90962
Formatter system
The formatter is responsible for the following:
• controlling the optional document scanner
• 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 Extended Capabilities Port (ECP)
mode 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 MCF5202 custom microprocessor operating at 35 megahertz
(MHz).
Random-access memory (RAM)
• One bank of Non-Volatile RAM (NVRAM) stores parameters
• DRAM (Dynamic RAM) provides temporary storage of copy, scan, and print data
Parallel interface
The formatter receives incoming data through its ECP interface. This interface provides high
speed and two-way communication between the printer and the host, allowing the user to
change printer settings and monitor printer status from the host computer.