Process for replacing non-volatile memory in electronic printing systems
US5263152A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1991 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Apr 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/835
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is provided for preserving the integrity of a memory in an electronic printer in the event that a printed wiring board with non-volatile memory is replaced. The memory includes plural disks providing permanent data storage and the non-volatile memory communicating with the disks. In the method, a processor identifier is provided with the printed wiring board. A time stamp indicating the date of installation of the printed wiring board is generated, and the processor identifier of the printed wiring board is combined with the time stamp to provide an identifier seal. Copies of the identifier seal are stored to each of the disks. The processor identifier of the printed wiring board is compared with the processor identifiers of the respective identifier seals of the disks in response to booting the processor. When the processor identifier on the printed wiring board is substantially different from one of the processor identifiers of the disks, the printed wiring board is replaced and the transfer of data between the non-volatile memory and the disks is inhibited until the processor identifier of the replaced wiring board and the processor identifiers of the disks correspond s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.