Operating system independent virtual memory computer system
US4868738A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1985 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Aug 15, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved virtual memory computer system comprising a main processing unit for executing application and operating system software without virtual memory code and independently of virtual memory operation. A dedicated second processing unit is provided for maintaining a memory map, which translates addresses in the main processing unit address space into physical memory addressess of a primary memory. A network interface allows pages or segments of data from a secondary memory connected to a communications network to be transferred into the primary memory in a manner transparent to the operation of the main processing unit. A direct memory access (DMA) circuit transfer the header portion of a network-transferred page of data into a separate auxiliary addressable memory for storage of network overhead information, while the useful data portions of the page are stored directly in locations in the primary addressable memory. A requested page of data is then placed directly in a desired location in primary memory without the need for moving or retransferring the data within the primary memory to strip off network header information after a DMA transfer. The system is responsive to de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.