Telesensory Systems Inc was a legendary Californian Assistive Technology company focussed on blind accessibility. Formed in 1970 around their first product, the portable Optacon text and image scanner. The Optacon was the first device to enable blind users to play text based computer games independently.
TSI went on to produce TSI Speech+ the world's first commercial talking calculator around 1975/76. This was no doubt used alongside an Optacon and Calculator Game books.
In 1977 on the shoulders of TSI Speech+, Pong, video game popularity but lack of access for blind people, came The Game Center.
This dedicated games machine played a range of eight action, memory and skill games. Of note, Paddleball is the earliest audio-game aimed at blind players to use stereo sound found to date (2-2024).
Learn more via the links and videos below.
Instructions Downloads
The Game Center (TSI) manual.
Audio cassette manual. Side A and Side B (the games).
Credits: Manuals on tape and PDF courtesy of The Dot Experience at APH Musuem - Accession Number: 1992.96a-c
Thanks to Ian Hamilton for the original link after a discussion on BBC Micro audio games. Also to Brian Etherbrian Brasher for the Pong headset art refresh of Martha Vaughan's Disabled USA original.