Computer emulator
US5758124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/45537
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
What is disclosed is an emulator that emulates on an execution machine the operation of a target machine. The emulator emulates routines that are called via a jump table such as the BIOS. Control is transferred to an emulation module not by directly trapping the procedure to call the BIOS but by placing a privileged instruction (a halt instruction, for example) in the area called and by causing a trap through the execution of the privileged instruction. An identifier is placed after the halt instruction and a needed BIOS emulation module is called by a dispatcher using this identifier. Therefore, normal operation can be obtained even if there is a resident program which rewrites the jump table.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.