US4737906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple virtual control unit
Assignee: International Business Machines Corp
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Filing: 1985-09-27
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Granted: 1988-04-12
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Expires: 2005-09-27
Abstract
Abstract A channel interface multiple virtual control unit controls a plurality of classes of terminal sessions on a graphics system workstation, the multiple virtual control unit includes lookup tables having indicia related to a class of display session to be enabled for controlling a workstation in either a alpha-numeric display mode or a graphics display mode.
Inventors
- 👤 Lewis M. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:10
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/1423
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
Apparatus for controlling one or more multiple session work stations, each supporting one or more classes of session, comprising: first means for controlling communication with one or more host channels; second means for controlling communication with one or more work stations; third means connected to said first and second control means for controlling command and data flow between said first and second control means; and fourth means, connected to said first means and to said third means, for selecting one of a plurality of classes of work station sessions in response to a channel command of a type associated with said one class.
Claim 2
Dependent Claim
103 words
Apparatus for controlling one or more multiple session work stations, each supporting one or more classes of session, comprising: first means for controlling communication with one or more host channels; second means for controlling communication with one or more work stations; third means connected to said first and second control means for controlling command and data flow between said first and second control means; and fourth means, connected to said first means and to said third means, for selecting one of a plurality of classes of work station sessions in response to a channel command of a type associated with said one class.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1, wherein said second means further comprises: a plurality of virtual control units, each controlling one class of said work station sessions.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 1, wherein said fourth means further comprises: one or more look up tables each having a plurality of entries, each entry containing a class identifier.
Claim 5
Dependent Claim
32 words
Apparatus according to claim 1, wherein said fourth means further comprises: a plurality of command look up tables, there being at least one such look up table for each work station class.
Claim 6
Dependent Claim
26 words
Apparatus according to claim 1, wherein said third means further comprises: means for resolving contention between simultaneous operations directed to a plurality of work station classes.
Claim 7
Dependent Claim
47 words
Apparatus according to claim 5, wherein said resolving means further comprises: a plurality of latches for storing a status for each work station class; and control means associated with said third means for responding to said simultaneous operations in accordance with said status contained in said latches.
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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |