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Wang LOCI-2 Calculator, Logarithmic Calculating Instrument

The Wang LOCI-2 Programmable Calculator was introduced in early 1965. It used more than 1,000 transistors, no integrated circuits, core memory, and NIXIE Tubes for the display. To dramatically improve the speed of multiplying it actually added logarithms. It supported a printer, Teletype, and punched card reader.

This LOCI-2 belonged to Wang field service and came with a case full of spare boards. The field service people would install known-good boards from the case to repair a customer's calculator. Then they would install the broken board in this LOCI-2 to determine the fault, repair the board, and put the repaired board back in the case. This LOCI-2 came with two punched card reader to load programs. Since this LOCI-2 is a Model 2AC it supports a Teletype as an I/O device using the 1412A board that goes in slot 9.



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The Punched Card Reader.


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Wang LOCI-2 Calculator with the cover removed.

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The Wang LOCI-2 Service Case and Service Manual.
A copy of the Service Manual is here.

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Click on the image for a larger view.
1402A N. Register with Binary Adder

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Click on the image for a larger view.
1404A Main Timing

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Click on the image for a larger view.
1408A Program and Decrement Counters plus Storages

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Click on the image for a larger view.
1412A Teletype Input and Output Control

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Click on the image for a larger view.
1501A Input Decoder Control




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