VDU line marker

Details VDU line marker VDU line marker

1991-12-24

1994-08-16

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345156, G09G 302

Patent

active

053390946

ABSTRACT:
A VDU line marker enables a specific line on a Visual Display Unit to be quickly and accurately located, similar to using a straight edge and/or a marker pen on paper. The line may be scrolled over the displayed information or the displayed information may be scrolled with the line stationary. A VDU electronic line marker is coupled between the Visual Display Unit and a computer/terminal combination and works independently of the software. It offers a choice of line color, line thickness and precise line position without using costly memory, memory controls, software, menus or multi-function use of keys and it derives its timing from the host computer.

REFERENCES:
patent: 4354185 (1982-10-01), Worborchil
patent: 4566000 (1986-01-01), Goldman et al.
patent: 4668947 (1987-05-01), Clarke et al.
patent: 4751504 (1988-06-01), Slavin
patent: 4782335 (1988-11-01), Gussin
patent: 4870389 (1989-09-01), Ishiwata et al.

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