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The "music" part of this home computer is housed in a detachable expansion, the SFG01, which also provides stereo outputs, MIDI OUT and a keyboard connector. Although it does have a standard internal sound chip, a Yamaha YM5214 is provided for FM sounds.
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It runs a dialect of the Basic language (MSX Basic) and much like the Commodores or Sinclairs of the time it boots directly into a Basic command line. It accepts standard MSX1 cartridges through the main upper slot. The computer architecture is built around the Z80 microprocessor, with 32kB of RAM and 16kB of VRAM. It's good plastic but it's a chore to type on. The keys are terrible: slider over rubber dome, linear switches with no resistance whatsoever when pressed. Variations in video outputs exist as well. For most of them, the power supply is a heavy external brick (and the cable to connect the computer is definitely too short) but the American (CX5MU) and Canadian (CX5MC) versions had an internal 120V power supply. The CX5M is the international version of the CX5F, but multiple regional variations were released. This is not Yamaha's first attempt to conquer the home computing market: the integrated system envisioned in 1982 around the PU1 didn't have much success however, and it was never released outside of Japan. Many Japanese manufacturers, including Sony, Canon and Toshiba made similar computers but the CX5M while fully compatible with the standardized platform, had some music-related additions specifically created by Yamaha.
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It's actually part of a broader push for home computing in Japan in the early 1980s, the MSX standard, that had a discrete success (especially in Japan) before IBM compatibles won the race. In 1984 Yamaha made a computer, for music production.