US4203102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Character display system
Assignee: International Business Machines Corp
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Filing: 1978-11-02
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Granted: 1980-05-13
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Expires: 1998-11-02
Abstract
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.
Inventors
- 👤 Alan F. Hydes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:23
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/16; G09G5/22; G09G5/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
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.
Claim 2
Dependent Claim
131 words
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.
Claim 3
Dependent Claim
57 words
A display system as claimed in claim 1 in which attributes for controlling the manner of character display are stored in said display buffer, each attribute being associated with one or more characters, and said read/write store stores words having a character slice byte and an attribute byte to associate an attribute with each character slice byte.
Claim 4
Dependent Claim
37 words
A display system as claimed in claim 1 or claim 2 in which each storage access to a word comprises a read out for a first scan line followed by a write for the next scan line.
Claim 5
Dependent Claim
77 words
A display system as claimed in claim 1 or claim 2 in which said storage words have scan line addresses 1 to N, comprising a counter controlled by direction selection logic for generating scan line addresses, the counter counting repeatedly from 1 to N or from N to 1 when the normal left to right mode is selected and counting from 1 to N and back to 1 when the reverse right to left mode is selected.
Claim 6
Dependent Claim
31 words
A display system as claimed in claim 4 comprising means to generate an input signal to the direction selection logic to specify the mode in which a character row is displayed.
Claim 7
Dependent Claim
58 words
A display system as claimed in claim 5, in which at least one line of data may be displayed in a normal left to right mode comprising an input to the direction selection logic when said at least one line is to be displayed whereby the counter counts repeatedly from 1 to N or from N to 1.
Claim 8
Dependent Claim
30 words
A display system as claimed in claim 1 in which each storage word stored by said read/write store comprises a character slice byte, an attribute byte and additional control bits.
Claim 9
Independent Claim
137 words
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.
Claim 10
Independent Claim
137 words
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.
Claim 11
Dependent Claim
58 words
A method as claimed in claim 8 comprising storing attributes for controlling the manner of character display in said display buffer with each attribute being associated with one or more characters and storing words in said read/write store each having a character slice byte and an attribute byte whereby an attribute is associated with each character slice byte.
Claim 12
Dependent Claim
58 words
A display system as claimed in claim 4, in which at least one line of data may be displayed in a normal left to right mode comprising an input to the direction selection logic when said at least one line is to be displayed whereby the counter counts repeatedly from 1 to N or from N to 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-13 | 1983-11-12 | 1984-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-13 | 1987-11-12 | 1988-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-13 | 1991-11-12 | 1992-05-13 | $7700.00 | Window Closed / Lapsed |