Data processing system write protection mechanism
US4432050A · kind A · utility
14Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1980 |
| Grant date | Feb 14, 1984 |
| Priority date | — |
| Expiry date | Oct 1, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Use of a control storage device coupled with a central processing unit is locked, during the loading process from the unit to the device, to a would-be user of the device until such loading process is complete as indicated by a so-called "unlock" command received from the central processing unit. An indication of an error or malfunction in the control storage device either during the loading process or thereafter is also provided to the central processing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.