Why do you ask, cost? The problem is that the stamp makes use of handshaking lines in RS232, therefore a full RS232 compatible interface is required. Nearly all wireless links dont provide a true RS232 inteface because of the complexity of including the handshaking, they cheat and only provide the data lines and therefore are not capable of programming a stamp.
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http://www.parallax.com/detail.asp?product_id=30076
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Chris Savage
Parallax Tech Support
csavage@parallax.com
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