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The calculator I am most dependent on is the Sharp EL-512. Ten memory registers. Can store four programs. Very powerful when the programs can read from and store into those ten memory locations AND when the program can stop to await manual data.
Don't know if any calculator (other than graphing types) can be programmed. Those graphing calculators are on the order of $100. A useful programmable calculator can easily be sold for $40 at good profit. But I don't know if anyone makes one equivalent to this early 1980 calculator.
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