DATA PROCESSING SYSTEM HAVING EMULATION CAPABILITY FOR PROVIDING WAIT STATE SIMULATION FUNCTION

摘要

An emulator for use in a data processing system for providing simulation of the machine wait state of the emulated central processor. A combination of hardware, firmware and software is provided to allow processing in the native mode of the data processing system while the emulated processor is in the wait state. Means are also provided for rapidly returning from the wait state to the emulation process in response to an emulator specific pending allowable interrupt. Means are further provided for indicating to the operator whether the emulated processor can in fact exit from the wait state and further means are provided for indicating to the operator the length of time the emulated processor has been in the wait state.