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MITS 1440 Desktop Calculator
MITS' (Micro Instrumentation and Telemetry Systems) 1440 Electronic Calculator
MITS' second desktop electronic calculator, introduced in early 1973, the 1440
used a revised version of the six-chip chip-set used in MITS' first electronic
calculator, the MITS 816. The revised six-chip chip-set was
extended to provide additional functionality, but the number of chips in the chip-set was reduced to five. This
was made possible by advances in Electronic Arrays' fabrication technology used to make the chips to allow more circuitry to be
packed into a smaller space. The added functions include single-key square root [√] and squaring [x2]
calculations, along with an accumulating memory register with [M+], [M-], [CM], and [MR] keys. The overall functionality
of the 1440 was the same as the 816, with the [D] key to set the fixed decimal point location from zero to seven
digits behind the decimal point. One feature of the 816 that was removed in the chip-set for the 1440 was the
"double-precision" mode of the 816 that allowed results of multiplications to return up to 16 digits. The 1440 used the same
cabinet as the MITS 816, with differlng cut-out areas on the keyboard panel for the additional function keys of the 1440.
The museum is looking for an example of this calculator that is complete and in good aesthetic condition, whether it is
working or not. If you have one of these calculators that you find a good home in the Old Calculator Museum, please click
the EMail button in the menubar above and get in touch with us.