Patent US1993973A successfully refreshed from Google Patents.
US3789367A
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US
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Memory access device
Assignee: International Business Machines Corp
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Filing: 1972-06-29
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Granted: 1974-01-29
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Expires: 1992-06-29
Abstract
Abstract The specification describes a memory access technique wherein a display or other controlled device accesses sequential locations in memory without control unit intervention following an initial address and a selection of operating mode. An interfaced display continously displays data, status, prompting and/or operator guidance information from selected memory locations independent of the system control unit following mode select and an initial address. The display as shown includes a wiggle sweep cathode ray tube display controlled by a series of counters.
Inventors
- 👤 E Dumstorff
- 👤 J Iverson
- 👤 P Schloss
- 👤 P Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:41
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/14; G09G1/18; G06; G06F; G06F3/00; G06F3/14; G06F3/153
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A data handling system comprising a control unit, memory means operatively connected to said control unit, a controlled device, adapter means interconnecting said controlled device with said memory means and said control unit, said control unit providing an initial address which identifies a subdivision of said memory, and said adapter means providing sequential addresses to said memory subdivision independent of said control unit subsequent to said initial address.
Claim 2
Dependent Claim
68 words
A data handling system comprising a control unit, memory means operatively connected to said control unit, a controlled device, adapter means interconnecting said controlled device with said memory means and said control unit, said control unit providing an initial address which identifies a subdivision of said memory, and said adapter means providing sequential addresses to said memory subdivision independent of said control unit subsequent to said initial address.
Claim 3
Dependent Claim
32 words
The data handling system of claim 1 wherein said adapter means includes a self incrementing register for identifying a recurring sequence of address locations within said memory subdivision following said initial address.
Claim 4
Dependent Claim
75 words
The data handling system of claim 1 wherein said controlled device is a CRT display comprising a wiggle sweep deflection circuit including, a first counter which gates dots within a sweep; a second counter, indexed by said first counter, which counts the sweeps within a character; a third counter, indexed by said second counter, which counts characters in a line; a fourth counter, indexed by said third counter, which counts the lines of the display.
Claim 5
Dependent Claim
35 words
The data handling system of claim 3 wherein said second counter accesses said memory means for the character resident at the next subsequent address position following the sweep which completes the character presently being displayed.
Claim 6
Dependent Claim
37 words
The data handling system of claim 4 further comprising a character generator and wherein said CRT display accesses said character generator when said first counter completes a sweep to determine the dot pattern of the next sweep.
Claim 7
Dependent Claim
106 words
A data handling system comprising a micro programmed control unit; memory means operatively connected to said control unit to receive data therefrom; a controlled device; adapter means interconnecting said controlled device with said memory means and said control unit; means for providing an initial address from said control unit to said memory whereby an operating mode is established for said controlled device, and address sequencing means for providing said controlled device a recurring sequence of addresses to said memory independent of said control unit subsequent to said initial address, with said sequence of addresses continuing until a new initial address is provided by said control unit.
Claim 8
Dependent Claim
106 words
A data handling system comprising a micro programmed control unit; memory means operatively connected to said control unit to receive data therefrom; a controlled device; adapter means interconnecting said controlled device with said memory means and said control unit; means for providing an initial address from said control unit to said memory whereby an operating mode is established for said controlled device, and address sequencing means for providing said controlled device a recurring sequence of addresses to said memory independent of said control unit subsequent to said initial address, with said sequence of addresses continuing until a new initial address is provided by said control unit.
Claim 9
Dependent Claim
38 words
The data handling system of claim 6, wherein said controlled device is a display and said initial address identifies a discrete block of data charaCter positions in said memory means which are to be presented on said display.
Claim 10
Dependent Claim
27 words
The data handling system of claim 7 wherein said control unit and said display access said memory during mutually independent time slices on a common data path.
Claim 11
Dependent Claim
54 words
The data handling system of claim 8, wherein said display is partitioned into two portions and said adapter means functions on command of said control unit to provide an initial address for each portion and a recurring sequence of addresses for each such portion to display data from two discrete areas in said memory.
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |