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The Rio PMP300 was one of the first portable consumer MP3 digital audio players, and the first commercially successful one. Produced by Diamond Multimedia, it was introduced September 15, 1998〔(Portable MP3 Player Announced - Harmony Central )〕 as the first in the "Rio" series of digital audio players, and it shipped later that year. ==Features== Roughly the dimensions of a deck of cards (3.5 inches by 2.5 inches and 0.625 inches thick), the Rio was black and had an LCD screen and a circular pad with control buttons. It had controls for skipping tracks forwards or backwards, repeat, random play and four preset equalizer settings. The LCD displayed the filename of the track being played. It could play MP2 and MP3 format audio files, and had support for a variety of bitrates, including MP3 variable-bitrate (VBR) support. It shipped with 32 MB of internal memory and had a SmartMedia slot, allowing users to add additional memory. It was powered by a single AA battery, which provided between 8 and 12 hours of playback time. Connection to a personal computer was through the computer's parallel port, with a proprietary connector on the Rio's edge. The Rio retailed for US $200 with the ability to hold around 30 minutes of music at a bitrate of 128 kbit/s. An upgraded version was later released, which was colored translucent green and equipped with a larger 64 MB internal memory, at a cost of $250. The Rio also spawned one of the first Digital Music service providers (ASP or SaaS Cloud Service), RioPort. RioPort was the first digital music service to license secure, single-track commercial downloads from major record labels. The Rio PMP300 was supplied with a copy of the "Music Match" software for managing the user's MP3 library. A selection of folk/country/blues MP3s were also provided, the metadata for which was in a Music Match specific format rather than as ID3 tags. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rio PMP300」の詳細全文を読む スポンサード リンク
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