a modern 16-bit central processing unit (CPU), but instead settled on an 8-bit CPU based on the inexpensive MOS Technology 6502, supplementing it with a custom graphics chip, the Picture Processing Unit, produced by Ricoh. To reduce costs, suggestions of including a keyboard, modem, and floppy disk drive were rejected, but expensive circuitry was added to provide a versatile 15-pin expansion port connection on the front of the console for future add-on functionality such as peripheral devices. The keyboard, Famicom Modem, and Famicom Disk System would later be released as add-on peripherals, all utilizing the Famicom expansion port. Other peripheral devices connecting via the expansion port would include the Famicom Light Gun, Family Trainer, and various specialized controllers. Many would be released in Japan only, such as the Famicom 3D System and Famicom Disk System. The wireless broadcast functionality of the TV Tennis Electrotennis (1975) got Nintendo designer Masayuki Uemura to consider adding that capability to the Famicom. He ultimately did not pursue it to keep system costs low. Famicom release in Japan (1983–1984) Nintendo held its own exhibition to unveil the Famicom, becoming a sensation among toy show exhibitors. Shortly after, the competing Sega SG-1000 was unveiled at the Tokyo Toy Show. Launching on July 15, 1983, the Family Computer (commonly known by the Japanese-English term Famicom) is an 8-bit console using interchangeable cartridges. The Famicom was released in Japan for (about $150 at the time, or equivalent to $ in ). Its launch game list is Donkey Kong, Donkey Kong Junior, and Popeye. The console itself was intentionally designed to look like a toy, with a bright red-and-white color scheme and two hardwired gamepads that are stored visibly at the sides of the unit. It sold well in its early months, at 500,000 units in its first two months. However, many Famicom units reportedly had faulty graphics chips and froze during gameplay. After tracing the problem to a faulty circuit, Nintendo voluntarily recalled all Famicom systems just before the holiday shopping season, and temporarily suspended production of the system while the concerns were addressed, costing Nintendo millions of dollars. The Famicom was subsequently reissued with a new motherboard. The Famicom easily outsold its primary competitor, the Sega SG-1000. By the end of 1984 Nintendo had sold more than 2.5 million Famicoms in the Japanese market. This made it the best-selling console in Japan, surpassing the Cassette Vision. Sales