[SiriusHardware]

Thanks to bluepilot for the working link.

That microdoctor is similar in concept to the idea of using an Arduino to replace the CPU in a system so it can read from / write to areas of the RAM and various I/O devices to check things out, only it is purpose made for that use.

Those are likely to be even rarer than the Softy 1 and Softy 2.