8051 simulator with programmable inputs

[Tech_n]

I hope I post in the right section.
I have an hex of an 8051 program, and for better understanding of the program function some simulation where watching memory is possible could be very helpful.
In the real hardware, the interupts and timer inputs are used for generating display multiplex, and controlling some other functions. The pins are connected to a divided clock frequency i suppose. The signals are generated in an ASIC.

Is there any 8051 simulator, where i can set the state of the input pins to some signal derived from the main clock? The best i found was MCU 8051 IDE, where I can connect a virtual display(which is good) and some buttons. But stepping a program and generating a 1kHz interrupt signal with a switch is not what i really want to do.

Can someone suggest a solution?