Invalid instruction code detector
US4167778A · kind A · utility
10Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1978 |
| Grant date | Sep 11, 1979 |
| Priority date | — |
| Expiry date | Jan 30, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/226
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A read-only memory, adapted to be addressed by the operation code portion of a computer instruction word, stores at addressable locations therein a flag indicating whether a particular combination of operation code bits is a valid combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.