The main cause of this problem with wireless devices is the interference issue with the USB 3.0 and 2.0 ports, which occurs when both the ports are located on the same side of the laptop.

[Ladyada] and [pt] had an old keyboard from NeXT, but since it used a custom protocol it wasn’t usable with modern hardware. So they built a custom device to convert the NeXT protocol to USB.

This isn’t a USB HID keyboard, instead it uses a USB-to-serial chip and appears to the host computer as a serial device. The keys themselves are simple momentary action switches, perhaps a ...