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Variable CRT Dot Widths From a Constant Frequency

IP.com Disclosure Number: IPCOM000060768D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Fawcett, BW [+details]

Abstract

The capability of changing the stroke widths of its characters without changing the video dot frequency and to dynamically vary the amount of change is given to a CRT terminal. This is done by changing the widths of either the first or the last dot in each scan line of each character stroke. The first dot can be shrunk, or the last dot can be stretched. The amount the dot width is changed can be adjusted on a character, row, or screen basis by the display adapter hardware and/or a microprocessor writable register. For stroke shrinking the dots making up the horizontal character slice come out of the character generator ROM (read-only memory) 1 and are loaded into a parallel-to-serial register or dot serializer 2.