The first step in programming display equipment, in order to produce a picture on the screen, is to generate a stream of binary words. These form a series of commands to the display; each command causing the display to carry out one of its functions, such as: to position the beam; to move it linearly painting a line; or to produce a character. Depending on the make of hardware and the word length, these various types of operation are distinguished by, say, the 4 most significant bits (or by control words which change the subsequent mode of operation) the remainder of the word being the binary values of X and Y, changes in X and Y (each usually to 10 bits), or the codes of 2 or 3 characters.
KeywordsRing Structure Control Word Topological Description Oriented Problem Graphic Language
Unable to display preview. Download preview PDF.
- S. Bird received the B.Sc.(Eng.) degree in Electrical Engineering from Kings College, London. He joined the Marconi Company in 1947 and has worked first on hardware and now on software aspects of digital equipment. He now heads a team producing the software for the Marconi Graphical/Tabular display.Google Scholar