PhDebug is a very strong software debug tool. It provides the possibility of debugging for pre-boot, Run Time, and system management interrupt (SMI) code. It uses either serial or bidirectional parallel cables connecting the host computer and the development platform.

In many development cases it reduces the requirement of an ICE (In-Circuit-Emulator)

PhDebug supports the Phoenix BIOS brands: Phoenix BIOS, Award BIOS, FirstBIOS Pro and FirstBIOS code.