Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Digital plotting facilities can be provided at the remote terminals of time-sharing computer systems. This is effected by equipping conventional plotters with adapters for translating standard telegraphic data signals into paper and pen movements.
Digital plotting facilities can be provided at the remote terminals of time- sharing computer systems. This is effected by equipping conventional plotters with adapters for translating standard telegraphic data signals into paper and pen movements.
The conventional six-element code used in remote data
transmission has code element positions respectively designated B, A,
8, 4, 2 and 1. To use signals of this kind for controlling plotter
movements effectively, arrangements are provided so that each
received data character can control the plotting of two points having
Cartesian coordinates X(1)Y(1), with respect to the origin, and
X(2)Y(2), with respect to X(1)Y(1), along with two vectors
respectively associated with these points, in accordance with the
Positions of B A 8 4 2 1 code elements in data character
Graphic Y(2) Y(1) +/-Y +/-X X(1) X(2) displacements and signs thereof (0 or 1) (0 or 1) (0=+) (0=+) (0 or 1) (0 or 1) (1=-) (1=-)
Direction of Vert. Vert. +down +right Horiz. Horiz. displacement -up -left or motion.
The order of plotting is vector from origin to point X(1)Y(1), point X(1)Y(1) vector from X(1)Y(1) to X(2)Y(2), point X(2)Y(2). The sign of the Y bit in position 8 applies to both Y(1) and Y(2) and determines the up or down direction of the paper movement, if any. The sign of the X bit in position 4 applies to both X(1) and X(2) and determines the right or left direction of the pen movement, if any.
The pen is engaged with and disengaged from the paper in response to the following commands: Pen down 0 0 0 1 0 0 Bit in 4 position only Pen up 0 0 1 0 0 0 Bit in 8 position only.
A pen up or pen down command must be followed by a conventional space character.
Drawing A represen...