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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.
In computers, a printer driver or a print processor is a piece of software on a computer that converts the data to be printed to a format that a printer can understand. The purpose of printer drivers is to allow applications to do printing without being aware of the technical details of each printer model.
A runtime library may provide basic program facilities such as for memory management and exception handling. [2] A runtime library is an artifact of the design of the toolchain used to build the program – not inherently required by the host operating system or the programming language in which the program is written.
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.
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]
The Hardware Abstraction Layer in the architecture of Windows NT. The Windows Hardware Abstraction Layer (HAL) is implemented in hal.dll. [1] The HAL implements a number of functions that are implemented in different ways by different hardware platforms, which in this context, refers mostly to the chipset.
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]
A Java typecast behaves similarly; if the object being cast is not actually an instance of the target type, and cannot be converted to one by a language-defined method, an instance of java.lang.ClassCastException will be thrown. [9]