Wang LOCI-2A Calculator
Logarithmic Calculating Instrument

The Wang LOCI-2 Programmable Calculator was introduced in January 1965, replacing the LOCI-1 that was introduced just four months before. The LOCI-2 has more than 1,000 transistors, no integrated circuits, core memory, and Nixie Tubes for the display. To dramatically improve the speed of multiplying and dividing it actually added or subtracted logarithms. It supported a printer, Teletype, and punched card reader peripherals.

This LOCI-2 is a model 2A, so it has 16 Storage Registers instead of 4 on the model 2, and no I/O interfaces.

This LOCI-2. #2814, was donated by Tom and Ingrid Barry. It was originally purchased by the GTE Sylvania Lighting Products Group in Danvers, Massachusetts.

Numbers are stored in the registers in Binary Coded Decimal format. There is a 1, 2, 4, and an 8 bit for each digit in a