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In a pinch, we made an RS232 to RS422 converter for use with the radio modems from a MAX232 and MAX488. From Digikey, the MAX488 is $2.81and the MAX232CPE is $3.31. Assuming the Stamp uses TTL levels on it's data lines, you'd just need the MAX488. However, it's not as simple as just building the converter and replacing a serial cable with the modems. The Screamer422 modems that are provided as part of the FIRST kit only support one of Ewave's data modes, which is called RM2000 and was specifically designed for the robotics competition. What that translates into is that the Screamer422 modems will only transmit data 26 bytes at a time. So, depending on what you're using them for they may or may not work. Also note that these models don't pass RTS/CTS or any other control lines, just the TX and RX data.
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