AV Famicom was adopted for a subsequent North American rerelease of the NES. The NES-101 model differs from the Japanese HVC-101 model in that it omits the RCA composite output connectors of the original NES-001 model, and sports only RF output capabilities. ASCII Entertainment reported in early 1993 that stores still offered 100 NES games, compared to 100 on shelves for Genesis and 50 for SNES. After a full decade of production, the NES was formally discontinued in the U.S. in 1995. By the end of its run, more than 60 million NES units had been sold throughout the world. Discontinuation and emulation (1995–present) The NES's market presence declined from 1991 to 1995, with the Sega Genesis and Nintendo's own Super NES gaining market share, with next-generation CD-ROM-based systems forthcoming. Even though the NES was discontinued in North America in 1995, many millions of cartridges for the system existed. The secondhand market of video rental stores, thrift stores, yard sales, flea markets, and games repackaged by Game Time Inc. / Game Trader Inc. and sold at retail stores such as K-Mart, was burgeoning. Many people began to rediscover the NES around this time, and by 1997, many older NES games were becoming popular with collectors. At the same time, computer programmers began to develop emulators capable of reproducing the internal workings of the NES on modern personal computers. When paired with a ROM image (a bit-for-bit copy of a NES cartridge's program code), the games can be played on a computer. Emulators also come with a variety of built-in functions that change the gaming experience, such as save states which allow the player to save and resume progress at an exact spot in the game. Nintendo did not respond positively to these developments and became one of the most vocal opponents of ROM image trading. Nintendo and its supporters claim that such trading represents blatant software piracy. Proponents of ROM image trading argue that emulation preserves many classic games for future generations, outside of their more fragile cartridge formats. On May 30, 2003, Nintendo announced that it would stop production of the New Famicom in September, completely discontinuing the Famicom alongside the Super Famicom (which was being manufactured as the Super Famicom Jr.) and the disk rewriting services for the Famicom Disk System. The last Famicom, serial number HN11033309, was manufactured on September 25; it was kept by Nintendo and