The Javelin Stamp Starter Kit includes this Javelin Demo Board. It has dual serial ports to demonstrate the background UART capability.

The Javelin Stamp Demo board (Figure 1.3) has the following features:

• Socket for the Javelin Stamp (Labeled U1)
• JIDE port for debugging, messages, and downloading programs from the PC into the Javelin Stamp.
• A power jack that can accept input voltage ranging from 6 to 24 VDC.
• A COM port that can be used to connect the Javelin Stamp to other computers. Alternately, you can attach a null modem adaptor to this COM port and then connect the Javelin to peripherals such as serial GPS units, mice, etc.
• Linear voltage regulator for prototype circuits.
• Small breadboard area for building, testing and prototyping circuits.

Downloads and Resources:
BASIC Stamp Module Comparison (.pdf)
Javelin Stamp Manual v1.0
Javelin Stamp Manual Errata (.pdf)
Other software & downloads
Power Supply Recommendation Chart