Simulator2003 is a windows based 8031/8032/87C51/87C52/89C51/89C52/8051/8052 microcontroller Simulator/Disassembler. Enhanced user interface and tools make it a perfect 8031/8032/87C51/87C52/89C51/89C52/8051/8052 Simulator/Disassembler giving you best Performance/Price ratio. Features not seen in other available Simulators/Disassemblers include Active Watch window, Close simulation for interrupt structure, Powerful debugging modes, Code Disassembler with save option, User friendly Break points interface, Adjustable simulation speed, Simulation load/save feature, Ability to pick labels from listing file, Bit memory window, Customizable simulation windows with auto and manual save option, Errors and warnings windows, General read/write options and many more.