Software Speech Synthesizers
With some clever programming it is possible to program a software Speech Synthesizer with good results.
Speech (Symbos software)
Games believed to use Software Speech Synthesizer
Note - This list is very probably incorrect (Ghostbusters was also listed here, which was incorrect, Ghostbusters contains digitized speech, not synthesizing. Same may apply for LastV8 and Robocop, this isn't verified yet though)
Games using Digitized Speech (Samples)
Digitized sound means a simple sound recordings (similar to modern .wav files). Unlike allophone based speech synthesizers, this method requires a lot of memory, typically allowing to store only a few words.
- Ghostbusters - 1bit samples (using PSG volume 00h and 0Fh)
- Trantor - 4bit samples (using PSG volume 00h through 0Fh)