At about half the price of the contemporary Commodore 4109 calculator, the basic four-function 884D, released in 1974, could be considered to be quite the bargain, retailing at $24.95, or about £130 in 2013 money. Although you can't tell from the advert, this calculator was one of the Commodore range that went with patriotic red, white and blue keys. The text of the advert is mildly amusing: "Let's face it! Aside from being the best thing that's happened to numbers and counting since the abacus, these amazing little electronic computers are really fun to use! All those neat little push buttons instantly producing accurate answers for you in bright, flashing red digital numbers. Order below. NOW.". Yes, do it NOW,