I scored a Magnevation SpeakJet Activity Center on eBay for $20 and have been playing around a bit and discovered it's the same chip used in the AtariVox+ Speech Synthesizer.

I decided to port the PhraseALator application to C#. Part of the process was to change from Mscomm32.ocx to .NET's SerialPort class in the System.IO.Ports namespace.