ROM emulation is a powerful and versatile method of microprocessor testing. ROM emulation has emerged as the technique of choice for microprocessor test and diagnostic applications. A microprocessor-based board is tested by replacing the boot ROMs on the Unit Under Test (UUT) with memory emulation pods. Each pod handles eight bits of the data bus. Processors from 8 to 32 bits can be controlled with one to four pods (even the most advanced CPUs such as the Intel Pentium generally use only an eight-bit boot path). The emulator takes control of the UUT by resetting the processor and, under the test programÕs control (monitor program), exercises all functions on the board. Synchronization with the UUT is automatic and requires no additional hardware or connections.