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Browse Prior Art Database

Character Generator

IP.com Disclosure Number: IPCOM000045032D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06

Publishing Venue

IBM

Related People

Authors:
Curlander, PJ Irwin, JW Rowe, DA [+details]

Abstract

The above drawing shows a low-cost character generator which converts a coded information data stream and command data stream to a drop pattern of noncoded (NCI) data. The coded information (CI) and command information are passed to the character generator through a buffer shared with a master control processor. The NCI data is passed to an interlace logic (not shown) on a bus with an interlocked control protocol. The character generator includes a microprocessor 10. The microprocessor 10 communicates the status to the master control processor (not shown) through text buffers 0 and 1. The processor 10 builds a CI page in the CI buffer with data and commands from the text buffers. It also loads the font random access memory (RAM), sets CI and font pointers for normal printing, and performs diagnostics.