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Yes there are portable CD players that also play cassettes, but are only found in boombox styles.
Try RCS Works for a digital media computer (or playback) in the 1980's Look at Wikipedia and also the definition off webcasting on wikipedia. One has to determine what you mean by player, playback, or portable, and what do you mean by portable. (Portable TVs can wait a bit, etc.) I'd also look (but this is not the first) for the history of Rio - one of the first popular portable media players. You also have to determine if you want a prototype, case study, patent, or if you want it manufactured, commercially and what would be the specs on that. Try the Consumer Electronics Associations Public Relations Department. Go to some portable media player sites. In Europe - digital radios - is this to you a portable media player happened a number of years ago - and was in the development for years. You may also want to check with the SBE or other engineering associations or the smithsonian. A company where I saw the first portable media player was Inka (?) I think that was then name in the mid-90s'
Yes most portable cassette players get radio and also record as well
Yes it is a portable media player. There is also software out there that helps you put your media on it. I use 123 copy DVD gold which works well for me and is easy, but what you choose it up to you.
There are many places where portable DVD players can be purchased. Wal-Mart, Best Buy and Target each carry portable DVD players in various brands and sizes. You can purchase the devices online or you can find them in the stores. You can also find new and used portable DVD players on eBay.
Anyone can buy portable DVD players online, it is not hard to find and also cheap to buy. You will find a huge range of quality portable DVD players at a cheap price on Amazon almost any day.
Apple produces a number of products that are relevant to digital media. iTunes is a digital media player that is downloaded onto a computer and upload media too. iTunes allows the user to sort by genre, artist, and playlist. For media players that are more portable, try and iPod or iPad, which will also hold media, depending on the size of the product.
Some of the best rated portable DVD players are Sony's 8-inch (Model # DVP-FX820), Phillips 10.2-inch, and Toshiba's 9-inch (Model # SDP93S). LG and Coby also make highly rated portable DVD players.
Various retailers sell portable DVD players like Walmart and Amazon. One could also go to a local computer store and ask if they have any DVD players specifically for kids for sale.
You should try the Bose SoundDock (R) Portable Black Digital Music System
Retailers such as Walmart and Best Buy carry many different models of Sony portable DVD players. Online retailers like Amazon also carry the players at competitive prices.
You are looking for the term UMD used for PSP games. It is also called a Universal Media Disc and is a disc format created by Sony for the PlayStation Portable