| 摘要 |
<p>A raster image processor for an all points addressable printer includes at least three digital computer controlled processing units (40, 42, 44) arranged in a parallel processing pipeline. The first unit (40) is a master processing unit that receives printing instructions and generates rendering commands. The record unit (42) is connected to the first unit by a dedicated bus (48) and receives the rendering commands over the bus and generates bit maps corresponding to the rendering commands. The third unit (44) is a memory unit connected to the second unit by a second dedicated bus (54), and receives the bit maps from the second unit and stores them in a page memory. All three units are connected by a communications and control bus (46) for overall coordination of the units.</p> |
