This is the official Service Manual for the Friden EC-130 Electronic
Calculator. It goes into great level of detail of how the logic of the
machine operates, down to the gate and flip-flop level. The document is
intended to be used in conjunction with the
EC-130 Computer Printout, which provides
information about the location of the various gates and flip flops, down
to the component level, on the circuit boards. This manual outlines
the four counter (early version, up to Serial #8500) EC-130 calculator.
As yet, I have not come across a similar manual for the more common
three-counter version of the EC-130.
Any re-distribution, printing, or online presentation of this document must include
the watermark indicating its source as the Old Calculator Museum. Thank you.
Friden EC-130 Service Manual
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