Installation and use of plural expanded memory managers
US5455919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1992 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Nov 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0623
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Simultaneous use of multiple expanded memory cards and their associated Expanded Memory Manager (EMM) device drivers in a computer system is provided. First, an expanded memory card is added and its EMM device driver will check to verify if another EMM driver is currently installed. If so, the new EMM device driver will take control of the existing EMM device driver in a master-slave relationship. The new EMM device driver (master) controls the existing EMM device driver (slave) by use of the slave's interrupt vector. That is, the master controls the slave by having an interrupt vector for the slave readdressed to be input to the master. Thereby, providing the master with the expanded memory interrupts the slave was required to service. The master also takes control of all the slave's handles and pages by appearing as a requesting program application to the slave. Another feature of the present invention will allow multiple EMM device drivers to be installed in an efficient manner, by eliminating code that is redundant between existing and newly added EMM device drivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.