It wasn't my first choice. That's an odd way to start a review, but I was not planing to purchase a PSI modem. I was, though, planning to leave on a trip and since at the time the other PowerBook modem manufacturer was still promising a release date of Real Soon Now [of course, now there are several internal PowerBook modems to choose from -Adam], I settled for the PSI PowerModem IV (currently about $360 mail order). Hardware -- The PowerModem IV is a 14,400 bps data, 14,400 bps send/receive fax modem with v.32 error correction and v.32bis compression that provide a maximum theoretical throughput of 57,600 bps