OVERVIEW1-2 XEROX DOCUPRINT 180 LPS PDL REFERENCELPS component typesLPS components consist of hardware and software.HardwareHardware refers to all the physical components of the LPS.Examples are the tape drives, the PC UI, the high-capacity feeder-stacker, and the physical subsystems of the system controller andthe printer. Refer to yourXerox DocuPrint 180 LPS Operator Guidefor detailed descriptions of the hardware components of your LPS.SoftwareSoftware refers to all coded instructions (programs) which areexecuted by the LPS. Some programs interface with LPS hardware,some with LPS firmware, and some with other software. Examplesare the LPS operating system, the PDL compiler, and the output task.LPS hardware componentsThe hardware components consist of the Advanced ImageSubsystem (AIS).Advanced Image Subsystem (AIS)The Advanced Image Subsystem (AIS) consists of three printed wireboards which contain character dispatcher, font and graphicmemory. The three boards read the character and image data andconvert it into video format for printing. With AIS, imaging a page is atwo-stage process performed by the hardware/firmwarecombination:Step 1. In the first step, referred to as “fill”, the video format is stored into a64-megabit memory called a ”page buffer.” The entire page isprocessed and stored into this memory resulting in a bitmappedimage.Step 2. In the second step, referred to as “dump”, the page buffer contentsare sent, one scan line at a time, to the laser.Two page buffers enable one page’s video to be ”filled“ into onebuffer at the same time that the previous page’s video is being”dumped” from the other page buffer.
