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The embedded firmware of a printer could thus eliminate the need to install any driver on a computer, by accepting print data in a general purpose format (e.g. PDF) via a networking protocol. Despite some efforts to standardize various stages of the printing pipeline, printer interfaces are largely still very proprietary and manufacturer-specific.
HP Universal Print Driver (UPD) is an intelligent print driver that supports a broad range of HP print devices, such as LaserJet and various MFPs. Developed by Hewlett-Packard , HP UPD combines a general purpose driver ( XPSDrv , UniDrv , or PSCRIPT ), print control, and HP proprietary extensions.
As originally used, firmware contrasted with hardware (the CPU itself) and software (normal instructions executing on a CPU). It was not composed of CPU machine instructions, but of lower-level microcode involved in the implementation of machine instructions. It existed on the boundary between hardware and software; thus the name firmware.
Laser head from HP LaserJet 5L printer. Most HP LaserJet printers employ xerographic laser-marking engines sourced from the Japanese company Canon.Due to a tight turnaround schedule on the first LaserJet, HP elected to use the controller already developed by Canon for the CX engine in the first LaserJet. [6]
Even drivers executing in user mode can crash a system if the device is erroneously programmed. These factors make it more difficult and dangerous to diagnose problems. [3] The task of writing drivers thus usually falls to software engineers or computer engineers who work for hardware-development companies. This is because they have better ...
The print mechanisms in HP's LaserJet line of laser printers depend almost entirely on Canon Inc.'s components (print engines), which in turn use technology developed by Xerox. HP developed the hardware, firmware, and software to convert data into dots for printing. [27]
WDM is the driver model used since the advent of Windows 98, whereas KMDF is the driver framework Microsoft advocates and uses for Windows 2000 and beyond. In general, since more features like power management and plug and play are handled by the KMDF framework, a KMDF driver is less complicated and has less code than an equivalent WDM driver.
The terminology runtime verification was formally introduced as the name of a 2001 workshop [2] aimed at addressing problems at the boundary between formal verification and testing. For large code bases, manually writing test cases turns out to be very time consuming. In addition, not all errors can be detected during development.
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