US3903510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scrolling circuit for a visual display apparatus
Assignee: AT&T Teletype Corp
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Filing: 1973-11-09
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Granted: 1975-09-02
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Expires: 1993-11-09
Abstract
Abstract A circuit for row addressing a storage memory supplying coded information to a visual display. The storage capacity of the memory is greater than the instantaneous display capacity. A row address counter provides the address of the first row displayed from the memory, the address of which is loaded into a second address counter which addresses the memory. Means are provided for rolling over the address counters and for tracking a cursor row address counter with the memory address counter.
Inventors
- 👤 George C Zobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:10
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/08; G09G5/34; G09G5/343
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
144 words
A method for row addressing a storage memory providing encoded information to a visual display having an instantaneous display capacity less than the memory capacity and tracking a cursor indicator therewith comprising the steps of: providing the address of the first row of the portion of the memory being displayed; loading said first row address into a second counter which serves to row address the memory to those memory rows being displayed; selecting the address of a row counter determining the row address of a cursor; comparing the address of the cursor row counter with the address of the second memory counter to determine whether the cursor address will place the cursor on the visual display; and varying the address of said first row of the portion of the memory being displayed to an address which will place the cursor upon the visual display.
Claim 2
Independent Claim
144 words
A method for row addressing a storage memory providing encoded information to a visual display having an instantaneous display capacity less than the memory capacity and tracking a cursor indicator therewith comprising the steps of: providing the address of the first row of the portion of the memory being displayed; loading said first row address into a second counter which serves to row address the memory to those memory rows being displayed; selecting the address of a row counter determining the row address of a cursor; comparing the address of the cursor row counter with the address of the second memory counter to determine whether the cursor address will place the cursor on the visual display; and varying the address of said first row of the portion of the memory being displayed to an address which will place the cursor upon the visual display.
Claim 3
Independent Claim
199 words
An apparatus for row addressing a memory providing encoded information to a visual display, the memory having a storage capacity exceeding the instantaneous display capacity of the visual display comprising: means for providing a plurality of selected command signals; a cursor address means for determining the row address of a cursor indicator, said cursor address means including means for varying the address thereof; first address means containing the address of the first row to be displayed from the memory, said first address means including means for varying the address thereof in response to one of said selected command signals; second address means selectively loaded with the address of said first address means and said second address means successively addressing saiD memory with respect to those memory rows being displayed; comparison means operable in response to a cursor row relocation command from said command means for comparing said cursor address with an address related to the address of said first row address means; and means operable in response to a comparison condition for varying the address of said first address means so as to maintain the row address of said cursor within those memory rows displayed upon the visual display.
Claim 4
Independent Claim
199 words
An apparatus for row addressing a memory providing encoded information to a visual display, the memory having a storage capacity exceeding the instantaneous display capacity of the visual display comprising: means for providing a plurality of selected command signals; a cursor address means for determining the row address of a cursor indicator, said cursor address means including means for varying the address thereof; first address means containing the address of the first row to be displayed from the memory, said first address means including means for varying the address thereof in response to one of said selected command signals; second address means selectively loaded with the address of said first address means and said second address means successively addressing saiD memory with respect to those memory rows being displayed; comparison means operable in response to a cursor row relocation command from said command means for comparing said cursor address with an address related to the address of said first row address means; and means operable in response to a comparison condition for varying the address of said first address means so as to maintain the row address of said cursor within those memory rows displayed upon the visual display.
Claim 5
Independent Claim
224 words
An apparatus for row addressing a memory, the memory providing encoded information to a visual display, the memory having a storage capacity exceeding the instantaneouss display capacity of the visual display and being divisible into at least two non-overlapping portions comprising: means for providing a plurality of selected command signals; row address means providing the address of the first row to be visually displayed from said memory, said row address means including means for varying the address thereof in response to a first selected command; cursor row address means for providing the row address of a cursor indicator on the display, said cursor address means including means for varying the address thereof in response to a second selected command so as to facilitate positioning the cursor over the visual display while displaying a fixed portion of the memory; means responsive to a third selected command for varying the address of said row address means and said cursor address means in a predetermined relationship; means for determining the presence of the address of the first row of each of said portions by said row address means, and means for varying the address of said row address means in response to a fourth selected command signal until the address of said row address means is that of the first row of one of said memory portions.
Claim 6
Independent Claim
224 words
An apparatus for row addressing a memory, the memory providing encoded information to a visual display, the memory having a storage capacity exceeding the instantaneouss display capacity of the visual display and being divisible into at least two non-overlapping portions comprising: means for providing a plurality of selected command signals; row address means providing the address of the first row to be visually displayed from said memory, said row address means including means for varying the address thereof in response to a first selected command; cursor row address means for providing the row address of a cursor indicator on the display, said cursor address means including means for varying the address thereof in response to a second selected command so as to facilitate positioning the cursor over the visual display while displaying a fixed portion of the memory; means responsive to a third selected command for varying the address of said row address means and said cursor address means in a predetermined relationship; means for determining the presence of the address of the first row of each of said portions by said row address means, and means for varying the address of said row address means in response to a fourth selected command signal until the address of said row address means is that of the first row of one of said memory portions.
Claim 7
Dependent Claim
41 words
The apparatus of claim 3 which further includes means for varying the address of said cursor address means in response to a change in the address of said row address means so as to maintain the cursor upon the visual display.
Claim 8
Independent Claim
190 words
An apparatus for row addressing a storage memory, the memory providing encoded information to a visual display, the memory having a storage capacity exceeding the instantaneous display capacity of the visual display comprising: first address means providing the address of the first memory row of a selected portion of the memory to be displayed; second address means selectively loaded with the address of the first memory row to be displayed as provided by said first address means, said second address means serving to row address the memory; means for sequentially advancing said second address means to address successive rows of the selected portion of the memory; means for providing a plurality of command signals for directing the operation of said first and second address means; means for selectively varying the first row address of said first address means in response to a first selected command signal from said commmand signal means thereby selecting an alternate portion of the memory for display; and means responsive to said first selected command signal and to a preselected address of said first address means for presetting said first address means to a predetermined address.
Claim 9
Independent Claim
190 words
An apparatus for row addressing a storage memory, the memory providing encoded information to a visual display, the memory having a storage capacity exceeding the instantaneous display capacity of the visual display comprising: first address means providing the address of the first memory row of a selected portion of the memory to be displayed; second address means selectively loaded with the address of the first memory row to be displayed as provided by said first address means, said second address means serving to row address the memory; means for sequentially advancing said second address means to address successive rows of the selected portion of the memory; means for providing a plurality of command signals for directing the operation of said first and second address means; means for selectively varying the first row address of said first address means in response to a first selected command signal from said commmand signal means thereby selecting an alternate portion of the memory for display; and means responsive to said first selected command signal and to a preselected address of said first address means for presetting said first address means to a predetermined address.
Claim 10
Dependent Claim
41 words
The apparatus of claim 5 which further includes means responsive to a second selected command signal from said command signal means and to a preselected address of said second address means for presetting said second address means to a predetermined address.
Claim 11
Dependent Claim
46 words
The apparatus of claim 5 wherein said first address means is preset in response to said first selected command signal and to the address of the last row of the memory by said first address means, to the address of the first row of the memory.
Claim 12
Dependent Claim
46 words
The apparatus of claim 5 wherein said first address means is preset in response to said first selected command signal and to the address of the first row of the memory by said first address means to the address of the last row of the memory.
Claim 13
Dependent Claim
40 words
The apparatus of claim 6 wherein said second address means is preset in response to said second selected command signal and to a preselected address of said second address means, to the address of the first row of the memory.
Claim 14
Dependent Claim
60 words
The apparatus of claim 6 which further includes means determining the row address of a cursor and a comparator which serves to compare the row address of said cursor with a selected address from said second address means and providing a control signal upon the coincidence thereto, said control signal serving to initiate a selected command from said command means.
Claim 15
Dependent Claim
42 words
The apparatus of claim 10 which further includes means responsive to a selected command signal from said command signal means and to a preselected address of said cursor row address means for presetting said cursor row address means to a predetermined address.
Claim 16
Dependent Claim
45 words
The apparatus of claim 11 wherein said cursor row address is preset in response to said selected command signal from said command signal means and to a preselected address of said cursor row address means to the address of the first row of the memory.
Claim 17
Dependent Claim
45 words
The apparatus of claim 12 wherein said cursor row address is preset in response to said selected command signal from said command signal means and to a preselected address of said cursor row address means, to the address of the last row of the memory.
Claim 18
Dependent Claim
44 words
The apparatus of claim 10 which further includes means for providing the address of the last memory row upon the visual display, said last row address being compared with said cursor row address by said comparator and in response thereto providing said control signal.
Claim 19
Dependent Claim
34 words
The apparatus of claim 10 wherein said comparator serves to compare the address of said first address means with the address of said cursor address means and provides said control signal in response thereto.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |