Radio Shack EC-4021 Scientific programmable calculator

General specifications
Type Scientific programmable calculator
Production years - - -
New price -
Operating system n.a.
Chipset/CPU Sharp LI3301A
I/O -
Performance index 0
Entry method Algebraic with precedence
Precision 11 digits
Advanced functions

Forensic result 9.0000156204

Scientific programmable calculator: Radio Shack EC-4021
Programming model Partially merged keystroke
Programming features

Program display Unknown
Program editing Unknown
Programming 40 program steps
Data 3 numbers
Secondary 0
Functions +
Type LCD
Size 10(8+2) digits
LWH 1407612 mm
Weight 85 g
Batteries 2LR44
External power -
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Scientific programmable calculator: Radio Shack EC-4021

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This page was last modified on February 6th, 2009

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3 Responses so far

I have a scientific calculator, cat. # 65-1081 And I need orerating instructions for it. Can you help me ?
Bruce Burroughs
May 27th, 2010
I have one of these. I have used it for 25 years I think. It is in excellent condition and still running off the same battery. I was looking for a PDF of the operating manual so I could program a simple Pythagorean formula. I have the printed manual too but can't find it right off. There is certainly nothing special about this calculator. I bought it because it was on sale and I needed one. It just stuck with me and it hanged in there. Why do you want these?
September 18th, 2009
i am looking to buy 2 of these calculators radio shack EC 4021 are they still available
mick z
September 15th, 2009