Denon turntables are compatible with all PC's right now.
There are to many types to count, there are usb turntables,dj turntables, laser turntables and classic turntables.
zZounds, Biz Chair, Urban Outfitters, Computer World, and Amazon all carry USB turntables. One of these is likely the best option when purchasing USB turntables.
The best USB turntables for converting your old vinyl records to CDs is USB 2.0. USB 2.0 is the fastest devise and you can read more at www.getusb.info
It really depends on what type of turntable you're looking at. For DJ turntables it's hit or miss.
Yes it is compatible with any USB.
You can purchase a USB turntable at department stores such as Sears. Best Buy also sells USB turntables by Sony.
You should consider if they have standard audio outputs, automatic play feature, the tone arms are already assembled, a built-in amplifier, it is compatible with the operating system being used.
You should be able to use standard USB turntables, or you can use any converting programs, which support MP3, but most of them do. They are also usually free-ware, so it is easy to get them by downloading.
It is not compatible with USB 1.1 but it is compatible with USB 2.0 and mostly it matters on what motherboard you have. With USB 2.0 is a USB 3.0 port, the speeds will be the same but if it is a USB 3.0 in a USB 3.0 port, the speeds will be increased to about 4.8 - 5 Gbps compared to 480 Mbps.
USB 3.0 Extensions are backward compatible. USB 3.0 Device cables are not.
You can have a USB Serial (COM) port and you can connect PCs together using Serial (COM) port.
ION turntables can be purchased at many websites. Among them are Amazon, eBay, CostCaptain, Walmart, IonAudio, Best Buy, Sears, Everyting USB, and Walmart.