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from Wikipedia:

The Doctor V64 (also referred to simply as the V64) is a development and backup device made by Bung Enterprises Ltd that is used in conjunction with the Nintendo 64. The Doctor V64 also had the ability to play Video CDs, audio CDs and had an option for applying stereo 3D effects to the audio.

The Doctor V64 came out in 1996 and was priced around $450 USD. Many third party developers used the V64 in lieu of the PC64 Development Kit sold by Nintendo; the V64 was considered an attractive, low cost alternative to the expensive N64 development machine, which was manufactured by Silicon Graphics at the time. The CPU of the V64 is a 6502 chip (the CPU from the Nintendo Entertainment System); the operating system is stored in the BIOS chip. It is likely that Bung reused most of the design of their earlier NES clones in the Doctor V64.

The Doctor V64 unit contains a CD-ROM drive which sits underneath the Nintendo 64 and plugs into the expansion slot on the underside of the Nintendo 64. The expansion slot is essentially a mirror image of the cartridge slot on the top of the unit, with the same electrical connections, thus the Nintendo 64 reads data from the Doctor V64 in the same manner as it would from a cartridge plugged into the normal slot.

source: wikipedia

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from Wikipedia:

The Nintendo 64 (ニンテンドウ64 Nintendō Rokujūyon?), often referred to as N64, is Nintendo′s third home video game console for the international market.

Named for the 64-bit CPU, it was released in June 1996 in Japan, September 1996 in North America, March 1997 in Europe and Australia, September 1997 in France and December 1997 in Brazil. It is Nintendo′s last home console to use ROM cartridges to store games (Nintendo switched to a MiniDVD-based format for the successor GameCube); handhelds in the Game Boy line, however, continued to use Game Paks. It was discontinued in 2002 in Japan, North America and PAL regions by the launch of Nintendo′s GameCube.

The N64 was released with two launch games, Super Mario 64 and Pilotwings 64, and a third in Japan, Saikyō Habu Shōgi. The N64′s suggested retail price was US$199 at its launch and it was later marketed with the slogan “Get N, or get Out!”. The console was released in at least eight variants with different colors and sizes. An assortment of limited edition controllers were sold or used as contest prizes during the N64′s lifespan. The N64 sold 32.93 million units worldwide, and in 2009 it was named the 9th greatest video game console by IGN, out of a field of 25. The N64 was a very popular main prize on Double Dare 2000.

source: wikipedia