Autopsy:

from Wikipedia:

The Speak & Math was published in 1980 with a shape identical to both the Speak & Spell and the Speak & Read but with a completely different keyboard layout, different game features, and a different color scheme. Where the American Speak & Spell had been colored red with yellow and orange accents, the American Speak & Math was gray with blue and orange highlights. The Speak & Math was designed to focus on mathematics in children of ages 6–12 with a library of over 100,000 random and preprogrammed problems.

It was regarded as the spiritual successor to TI’s earlier DataMan series[81], with the difference mainly relating to the addition of speech synthesizing software and the visual display. The Speak & Math was only released to American and British markets.

In 1982, a compact version of the Speak & Math was developed contemporaneously with the Speak & Spell Compact. This version was only released in French as Les Maths Magique (lit. The Magical Math). A redesigned version was developed in 1985 for British markets under the name of Maths marvel. This was later released in Italian as Dotto Conta-Parla, in French as le Calcul magique (lit. Magical Calculator), and in German as Mathe-Fix.

The Speak & Math was very minutely redesigned in 1986, under the same name, with the new version representing nothing more substantial than a redesign of the faceplate graphics. In 1990 the Super Speak & Math was released as a major redesign similar to the first version of the Super Speak & Spell. As with the Super Speak & Spell, the display screen of the Super Speak & Math was changed to an LCD screen instead of the former VFD screen.

The keyboard was also expanded and given more functions. The general structure of the console was also altered similarly to the Super Speak & Spell such that the handle which had come at the top of the screen in prior Speak & Math units was now found on the bottom of the toy and ergonomic features were added to the shape.

source: wikipedia