HP 2300 Service Manual - Page 102
Formatter hardware, Read-only memory ROM, Random-access memory RAM, Nonvolatile memory NVRAM - laserjet jetdirect card
UPC - 808736470698
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Page 102 highlights
Formatter hardware The formatter system contains the following: q CPU-Is a 266 Mhz RISC microprocessor. q Read-only memory (ROM)-Stores the dot patterns of internal character sets (fonts) in addition to storing microprocessor control programs. q Random-access memory (RAM)-Stores printing and font information received from the host system, and can also serve to temporarily store a full page of print-image data before the data is sent to the print engine. Increasing the RAM will increase performance of graphic intense printing operations but it will not increase the I/O buffer space or cause the printer to print more pages per minute. q Nonvolatile memory (NVRAM)-Stores information about the I/O and print environment configuration. The printer keeps the contents of NVRAM when the power is turned off or disconnected. (As in other HP LaserJet printers, downloaded fonts and macros are saved in conventional RAM and are lost when power is turned off.) q Interfaces • Parallel interface-Receives incoming data through its IEEE1284 B interface connector. The IEEE1284 B interface provides high-speed, two-way communication between the printer and the host, letting the user change printer settings from the host computer. • USB-Receives incoming data through its universal serial bus (USB) connector. The USB interface provides high-speed, two-way communication between the printer and the host, letting the user change printer settings computer. • EIO-The PCI-based enhanced input/output (EIO) slots support a wide range of print servers and other add-on devices. HP JetDirect EIO cards provide high-speed, two-way communication for network printing over Ethernet, Ethernet and LocalTalk, Token Ring, or Fast Ethernet networks. 100 Theory of operation ENWW