Character display system
AssigneeInternational Business Machines Corporation
InventorAlan F. Hydes
Life of this patent
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Abstract
A display system is described in which left to right or right to left mode may be displayed without character inversion. A read/write store is added between a display buffer and a CRT. This store stores one complete scan line of character slice bytes in sequence. The bytes may be read out either in a normal sequence or in a reversed sequence for display. As bytes are read in parallel, the orientation of individual characters is unchanged. One line of control data or selected lines may always be displayed in left to right mode, while the remainder of the display is in right to left mode.
Claims10
A display system utilizing a given display element accessing pattern in which characters may be displayed either in a normal left to right mode or in a reverse right to left mode comprising a display buffer for storing characters to be displayed, a read/write store for storing one complete scan line of character slice bytes as storage words in a predetermined sequence and means to read out the storage words in parallel with constant orientation from said read/write store selectively either in the predetermined sequence or in a reverse sequence to a parallel to serial converter for display, whereby data is displayed selectively either in a normal left to right mode or in a reverse right to left mode, with individual characters having unchanged orientation, without requiring alteration of said pattern.
A method of manipulating data in a display system utilizing a given display element accessing pattern in which characters may be displayed either in a normal left to right mode or in a reverse right to left mode comprising storing characters to be displayed in a display buffer, storing one complete scan line of character slice bytes as storage words in a predetermined sequence in a read/write store, reading out the storage words in parallel with constant orientation from the read/write store either in the predetermined sequence or in a reverse sequence and converting the parallel words to serial scan line data for display, whereby data is displayed selectively either in a normal left to right mode or in a reverse right to left mode with individual characters having unchanged orientation, without requiring alteration of said pattern.
Dependencies are inferred from the claim text.