During the 1990s, the Fondation Centre Louis-Hébert out of Quebec, Canada worked with the company ElectroConcept to produce two scientific calculators, the EC 9056 and the EC 9056 AF. These calculators were designed especially for people with visual impairments. When the keys are pressed or an operation is performed, the calculator speaks to inform the user.
Along this same line, the calculators came with both the paper instruction manuals and audio recordings of those manuals on compact cassette. This tape is labelled as "Instruction Cassette Audiocalc EC9056AF Version 1.09 September 1994". The audio is contained only on the left channel. However, this upload includes both that original version and a version with the same audio on the left and right channel.