Data processor employing electronically changeable control storage
Abstract
Abstract 1,154,299. Microprogramme-controlled computers. INTERNATIONAL BUSINESS MACHINES CORP. 14 May, 1968 [23 May, 1967], No. 22789/68. Heading G4A. A microprogramme-controlled electronic digital computer includes a plurality of control stores at least one of which is an electronicallychangeable control store, and means for loading micro-instructions into an electronically-changeable control store while the computer is operating under the control of micro-instructions stored in the other control store or stores. One read-only and two read-write control stores are provided and the latter can be loaded from a main store, an external control programme store, or a register receiving micro-instructions modified in an arithmetic and logic unit.
Inventors
- 👤 Bob O Evans
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |