Editing display system with dual cursors

Details Editing display system with dual cursors Editing display system with dual cursors

1977-12-05

1980-02-26

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340706, 340711, 340724, 340799, G06F 314

Patent

active

041908350

ABSTRACT:
An editing display system using a CRT display, with variable margin and tabulation facilities. Dual cursors are provided on the display: the first indicating the row and column in the display selected by the user, the second "shadow" cursor appearing in the same column but on the rule indice line of the display. The dual cursor function is implemented by providing a random access memory which is partitioned into data sets in which the first character represents the location of a cursor on a given line, and the remaining characters identify the actual characters on that line. Direct memory access including fixed format information is used for transferring the data in memory to a shift register in the video control portion of the system.

REFERENCES:
patent: 3974493 (1976-08-01), de Cavaignac et al.
patent: 4070710 (1978-01-01), Sukonick et al.
patent: 4078249 (1978-03-01), Lelke et al.

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