High Quality Content by WIKIPEDIA articles! The NEC µPD7720 is the name of fixed point digital signal processors from NEC (currently Renesas Electronics). It was introduced in 1980, at which time it was the first commercial DSP in the industry. The NEC µPD7720 runs at 4 MHz frequency with 128-word data RAM, 512-word data ROM, and 512-word program memory, which has VLIW-like instruction format, enabling all of ALU operation, address register increment/decrement operation, and move operation in one cycle.