J51 a Java Intel MCS51(8051,8052, etc) family microprocessor emulator, with integrated disassembler, debugger, Intel hex file loader and more. Standard peripheral emulated Timer 0/1 (Mode 0,1,2 and interrupt), Serial interface (Only in polled mode) ,Standard port 0 to 4. Microprocessor Intel MCS 8051 (no peripheral),Intel 8051,Intel 8052,Philips LPC674,Philips LPC900. Follow the link and free download J51 now.