The Pc Engine Duo is a fourth-generation video game console developed by NEC Home Electronics. It’s a Japanese game console released in September 1991.

The Duo is a combination of the PC Engine and Super CD-ROM2 systems packaged in a modern, sleek, matte-black casing. 

The minimalistic design contradicts the machine's capabilities.  The console integrated Super System Card technology within its motherboard and provided 192 KB of extra RAM. 

This extra memory was utilized to boost system performance in addition to providing space for internally saving game data (a first for any NEC console). 

The Duo was compatible with HuCards, CD-ROM2 and Super CD-ROM2 right out of the box (in addition to Audio CD and CD+G software).  This provided great value for the gamer due to the huge library of compatible NEC titles that were available in 1991 (400+).