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Improving Simulation Speed->Enable/Disable Interrupts
Use this option, by selecting it from the Options menu, to enable and disable the handling of interrupts.
By default the simulator will simulate the 8051 interrupts. To do this, it calls a subroutine before the simulation of each normal instruction and this subroutine looks after the interrupts.
It your program does not use interrupts, then you can disable this facility by toggling this option. The interrupt handling subroutine is then by-passed and the simulation will proceed faster.
The setting of this option will apply only to the active 8051 program. It will be saved in the program status file for this 8051 program and restored when you next load this same program.