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TSI The Telesensory Systems Inc. Speech+ shown here was the first commercial hand-held talking calculator for the blind.  Also on this page is a talking calculator aimed as and educational aid for youngs. 

This was the first commercial hand-held speaking calculator and a very early use of speech synthesis in a consumer product.

The TSI S14001A was developed by TeleSensory, Inc. and Silicon Systems, Inc. in 1975 as a single-IC speech chip for the Speech+ portable talking calculator for the blind.  The speech technology was licensed from Forrest S. Mozer, a professor of atomic physics (speech was a spare time thing for him) at University of California, Berkeley.  Ed Bernard worked for Silicon Systems, Inc., and was the design engineer for the S14001A speech chip.

With Permission of the Author vintagecalculators