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==Summary==
Initially, Texas Instruments (TI) intended to sell add on vocabulary cartridges that plugged directly into the speech synthesizer into the lifting door on the front of the unit. However; it was quickly realized that vocabulary expansion was easily achieved in software, therefore; the expansion cards were quickly disbanded and never developed or sold for the speech synthesizer. The speech synthesizer was one of the most purchased and available add-on modules around for the TI-99/4 - TI-99/4A system as it was given away near the end of the computer's life with software titles.