Basically a rotary switch construction set, the Geniac contained six perforated masonite disks, into the back of which brass jumpers could be inserted.

The jumpers made electrical connections between slotted brass bolt heads sitting out from the similarly perforated masonite back panel.

Setting up Geniac to solve a new problem or perform a new operation involved rewiring the jumpers on the back panel, a task advertised as taking only a few minutes.

[4][5] Widely advertised in magazines such as Galaxy Science Fiction,[6] the Geniac provided many youths with their first hands-on introduction to computer concepts and Boolean logic.

[1] Oliver Garfield also sold the Otis King's Patent Calculator, a helical slide rule, under the Geniac brand.