Introduction. Adapt11 is a family of compact, intelligently designed boards containing all the elements common to practically every 68HC11 design. Clock circuitry (8MHz crystal), reset circuitry (including a pushbutton), a mode select switch, a 5-Volt regulator, and an RS-232 interface are all provided on-board. All of the microcontroller I/O and control lines are brought out to a versatile 50-pin header pattern on the printed circuit board. This allows for several different connector options, to support a wide variety of applications.