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Here you can find the description of the Service USB core, the basic USB interface for Apple Macintosh

Description | Software | Manual | Order page

Service USB core is used as the base for proprietary development. It is an open frame printed circuit with four digital inputs and four digital outputs.

The I/O ports work with 5V logic and have no protection against overvoltage. The large assortment of additional software makes it possible to control the interface of nearly every program.

Service USB core has the following connections and interfaces:

• An USB connector at the back in the centre. Power is supplied to Service USB core via the USB interface.
• Four red LEDs for the status indication of each input.
• Four red LEDs for the status indication of each output.
• One green LED shows that the Macintosh driver has been connected and that the interface is working properly. This LED must always be on during use.
• One 74HCT244 mounted on a holder, which works as a buffer between the microcontroller and the I/O lines
• One strip connector with 2.54mm (0.1") clearance connects to the 4 inputs, 4 outputs and 5V auxiliary voltage.
• One resettable fuse between USB and buffer-IC. The green LED indicates that there is no short.
• Four distance pieces with metric screw thread M3 for mounting the board in self made apparatus.

System requirements

A Macintosh with USB and OSX 10.3 to 10.5 is required to operate Service USB plus. Up to 100 Service USBs can be run on a Macintosh.