MITS 1440 Calculator Flyer The 1440 was MITS' second desktop electronic calculator. It uses an updated version of the Electronic Arrays chip-set that was used in the MITS 816, the first electronic calculator marketed by MITS. The updated chip-set uses five chips instead of the six in the 816, and while using fewer chips, added single key automatic squaring and square root functions, and an accumulator-style memory register. The machine operates with fixed decimal point positioning, with the decimal point setting defined pressing a special [D] key on the keyboard at the same time as pressing a digit key from [0] through [7]. The calculator has a capacity of fourteen digits, the largest capacity in terms of displayed digits of any MITS electronic calculator. The display is made from early individual seven-segment LED display packages, with each segment formed by two tiny LED dots. The MITS 1440 was first introduced in Radio-Electronics magazine in June, 1972.