This is the hardware in the wooden “shadow” box with the 4-line x 40 character LCD display. It is used to develop programs for the included Parallax Stamp II microcontroller. In addition to the display it has a 6-position “Mode” switch, an up-down momentary switch, a PC-compatible serial port, and a D-25 P connector with five input and five parallel outputs. It is powered by an internal switching power supply with a 9V rechargeable backup battery. It is programmed in its special Basic via the Parallax editor on a PC connected to the microcontroller via a serial link to its programming port. Accurate timekeeping is provided by a digital watch circuit with a crystal-controlled 32 Hz output.
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