Previewing: PIC emulation software and disassembler 
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I didn't like the MPLAB simulator, so I wrote my own. It's DOS based, but quite fast (~3.5 MIPS emulating a 16F877 on a PIII-600), and more complete than MPLAB (serial, EEPROM, self-FLASH, etc). It's open-source, with 12C509A, 16F84A, 16F628, and 16F877 versions available. Others can be written easily. In addition, I've written an intelligent
PIC emulation software and disassembler owned by: picemu
A member of PICmicro Sites since 11/03/2008.