Printer Character Generator With Image Feature
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Fig. 1 shows a data flow for the character generator (C-Gen). This C-Gen takes data via the channel through a Printer Channel Adapter (PCA). The processor interrupts the print data from the channel. The image to be printed can be either characters or graphic pictorial image. In either case this image must be placed in the pattern store for characters (PSC). When the dot patterns, one for black, zeroes for white, are sent to the printer, they are formatted in quads (4 by 4 patterns of bits) and stored in the PSC. All patterns to be printed must reside in the PSC. The data that tells the printer where to print the patterns is interrupted by the processor. The processor builds a table of codes, which the sequencer will interrupt as the page is being printed, to move the patterns from PSC to the raster buffer (RB).