US3683359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video display terminal with automatic paging
Assignee: Delta Data Systems Corp
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Filing: 1971-04-30
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Granted: 1972-08-08
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Expires: 1991-04-30
Abstract
Abstract A video display terminal is provided having a refresh memory, a character generator and a display means. The refresh memory is utilized to enable the character generator to provide signals to the display means for displaying characters. The codes of the characters are stored in the refresh memory. The refresh memory has a capacity to have stored therein a plurality of contiguous lines of characters larger than the number of lines which can be simultaneously displayed on the display. Means responsive to the refresh memory are provided for enabling the display of a selected plurality of contiguous lines of characters from the refresh memory in the display means which includes selection means for changing the selected lines from the refresh memory which are displayed in the display means.
Inventors
- 👤 Andrew J Kleinschnitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:47
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/42; G09G1/00; G09G1/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
In a video display terminal having a refresh memory, a character generator and a display means wherein said refresh memory is utilized to enable said character generator to provide signals to said display means for displaying characters, the codes of which are stored in said refresh memory, said refresh memory having stored therein a plurality of contiguous lines of characters larger than the number of lines which can be simultaneously displayed on said display, means responsive to said refresh memory for enabling the display of a selected plurality of lines of characters from said refresh memory in said display means, and said means responsive including selection means for changing the selected contiguous lines from said refresh memory which are displayed in said display means.
Claim 2
Dependent Claim
124 words
In a video display terminal having a refresh memory, a character generator and a display means wherein said refresh memory is utilized to enable said character generator to provide signals to said display means for displaying characters, the codes of which are stored in said refresh memory, said refresh memory having stored therein a plurality of contiguous lines of characters larger than the number of lines which can be simultaneously displayed on said display, means responsive to said refresh memory for enabling the display of a selected plurality of lines of characters from said refresh memory in said display means, and said means responsive including selection means for changing the selected contiguous lines from said refresh memory which are displayed in said display means.
Claim 3
Dependent Claim
15 words
The video display terminal of claim 1 wherein said refresh memory comprises a recirculating register.
Claim 4
Dependent Claim
41 words
The video display terminal of claim 2 wherein said recirculating register is connected by a return loop, said return loop having means for shortening and lengthening the recirculation path so that characters in said refresh memory can be inserted and deleted.
Claim 5
Dependent Claim
42 words
The video display terminal of claim 1 wherein control characters are provided in said refresh memory for indicating the end of a line of data so that all of said characters in said refresh memory are sequentially stored in said refresh memory.
Claim 6
Dependent Claim
54 words
The video display terminal of claim 4 wherein control characters are provided in said video display terminal for defining the start of the characters stored in the refresh memory, the start of the display portion of the characters stored in said refresh memory and the end of the characters stored in said refresh memory.
Claim 7
Dependent Claim
40 words
The video display terminal of claim 5 wherein said terminal includes control means for removing said character representative of the start of the characters to be displayed from one position and returning it to another position withiN said refresh memory.
Claim 8
Dependent Claim
95 words
The video display terminal of claim 6 wherein said control means comprises means for recognizing said start of display character when it is positioned in a predetermined portion of said recirculation path, means responsive to said control means for shortening the recirculation path when said start of display character is determined, maintaining said shortened path until such time as the desired position in said refresh memory for said start of display character is located in said recirculation path and lengthening said recirculation path at the desired position for insertion of said start of display character.
Claim 9
Dependent Claim
110 words
The video display terminal of claim 6 wherein said control means further include counting means for counting the number of end of line characters that pass through said recirculation path, said counting means including a pair of counters, the first of said counters being maintained at a count which enables the start of display character to be placed one line earlier in said refresh memory and a second counter being maintained at a count to enable the determination of the placement of the start of display character a predetermined number of lines in said refresh memory from the control character for the end of the characters in the display memory.
Claim 10
Dependent Claim
37 words
The video display terminal of claim 1 wherein said terminal further includes a line buffer register, said line buffer register being utilized to address the character generator for displaying a line of characters on the display means.
Claim 11
Dependent Claim
128 words
In a video display terminal, a recirculating register having a variable length recirculation path, said recirculating register having stored therein the coded representation of a plurality of data characters and control characters, said control characters including a first character which indicates that each of said data characters in a predetermined plurality of rows of characters immediately following said first character are to be displayed, means responsive to said recirculation path for determining the presence of said first character therein, said means responsive including means for shortening said recirculation path to remove said first character and means for restoring the length of said recirculation path to reinsert said first character in a different portion of said recirculating register with respect to the data characters and control characters stored therein.
Claim 12
Dependent Claim
128 words
In a video display terminal, a recirculating register having a variable length recirculation path, said recirculating register having stored therein the coded representation of a plurality of data characters and control characters, said control characters including a first character which indicates that each of said data characters in a predetermined plurality of rows of characters immediately following said first character are to be displayed, means responsive to said recirculation path for determining the presence of said first character therein, said means responsive including means for shortening said recirculation path to remove said first character and means for restoring the length of said recirculation path to reinsert said first character in a different portion of said recirculating register with respect to the data characters and control characters stored therein.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |