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Draws its power from the USB connection - a power adapter is not. Easily plugs into a USB port on an iMac, iBook, current G4 Macintosh. The USA-28X from Keyspan fits into one USB port and provides 2 serial interface ports to enable use of your original Mac peripherals.
#MAC USB SERIAL DRIVER DRIVER#
I'm not a Mac expert, so take this paragraph with a grain of salt: Apple has a driver development kit called the I/O Kit, which apparently requires you to write your driver in C++, unless they also have some sort of user-mode driver framework. Previous Mac computers had serial ports for printers and other peripherals.
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There are also software USB analyzers that hook into the OS's USB stack, but they don't show all of the traffic on the bus, and may not be as reliable. Another established manufacturer is LeCroy (formerly CATC). For example, the Catalyst Conquest is $1199. You can see what data is being transmitted to the device using a USB bus analyzer, which is an expensive proposition for a hobbyist but is well within the reach of most businesses doing USB development. Reading the USB specification is a good place to start. USB is a packet-based bus and it's very important to understand the various transaction types. Otherwise, you're going to have to get information about the vendor commands used to communicate with it from one of three sources: the manufacturer reverse engineering the protocol used by the Windows driver or from others who have already reverse engineered the protocol in order to support the device on Linux or BSD. If the watch supports a standard USB device class specification such as HID or serial communication, there might already be a Macintosh driver for it built into the OS.