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HP-GL, short for Hewlett-Packard Graphics Language and often written as HPGL, is a printer control language created by Hewlett-Packard (HP). HP-GL was the primary printer control language used by HP plotters. [1] It was introduced with the plotter HP-9872 in 1977 and became a standard for almost all
Many printer vendors have extended PJL to include commands proprietary to their products. Not all PJL commands documented by HP are implemented in all HP or other vendor products. [citation needed] PJL resides above all the other printer languages and parses commands first. The syntax mainly uses plain English words.
In information technology, a write-only memory (WOM) is a memory location or register that can be written to but not read.In addition to its literal meaning, the term may be applied to a situation when the data written by one circuit can be read only by other circuitry.
The plain-text commands and code examples shown in the PCL programming documentation are meant to be compiled with a utility like HP's JetASM before being sent to a printer. PCL 6 Enhanced is designed to match the drawing model of Windows GDI .
A posted write is a computer bus write transaction that does not wait for a write completion response to indicate success or failure of the write transaction. For a posted write, the CPU assumes that the write cycle will complete with zero wait states, and so doesn't wait for the done. This speeds up writes considerably.
which specifies that the printer understands PostScript Level 2, is a color device, and so forth. The PPD can describe allowable paper sizes, memory configurations, the minimum font set for the printer, and even specify a tree-based user interface for printer-specific configuration.
When a writer is writing the data, all other writers and readers will be blocked until the writer is finished writing. A common use might be to control access to a data structure in memory that cannot be updated atomically and is invalid (and should not be read by another thread) until the update is complete.
Virtual PDF printers for Microsoft Windows: Bullzip PDF Printer – there is a free version; CutePDF; DoPDF – this is a simplified version of NovaPDF; PDFCreator – a Ghostscript-based virtual printer for Microsoft Windows, with user interface for advanced options (security settings, combining multiple documents, etc.).