Company: Radio Shack
Years in Production: Around 1994
Original Price: $24.99
Battery: Solar with Battery backup (RS 389A)
Type: Desktop- Fold-able
Number of Digits: 10
Initial cost and year came from the CALCUSUEM web site: http://www.calcuseum.com/SCRAPBOOK/BONUS/46394/1.htm (retrieved August 4, 2019)
I paid $3 for this at a swap meet.
The some of the keys are larger than the others. The plus key has an L-shape, while the minus key is large, and the equals key, labeled the “ANSWER BAR”.
The keyboard is alright. If you type at a reasonable pace, the keys are responsive. If you are speed typist, prepare to be disappointed.
The EC-2024 works best when the calculator is under full light.
There are two settings switches:
Rounding: always round up, always round down, or 5/4 (use the general rounding rules)
Decimal Setting: float, 0 decimal places, 2 decimal places, 3 decimal places, or add mode. In add mode, every number that is added or subtracted is automatically divided by 100. This allows for rapid entry of dollars and cents without having to enter the decimal point.
The Δ% Key
How the percent key [ Δ% ] depends on what arithmetic operation is used with it.
x [ + ] y [ Δ%] returns (x + y)/y * 100%
Example: 250 [ + ] 300 [ Δ% ] returns 183.3333333
x [ – ] y [ Δ% ] returns (x – y)/y * 100%
Example: 250 [ – ] 300 [ Δ% ] returns -16.66666666
(This is the true percent change function, x is new, y is old)
x [ * ] y [ Δ% ] returns x + x * y / 100
Example: 250 [ * ] 300 [ Δ% ] returns 1000
x [ ÷ ] y [ Δ% ] returns x/(1 – y/100)
Example: 250 [ ÷ ] 300 [ Δ% ] returns -125
It’s a nice calculator and will fulfill the basic needs. The keyboard is nice and fold-able. If you get it, spending a few dollars (like no more than $5) is good.
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