"E" indicates an error condition. This is generally caused by attempting a calculation out of the calculators possible range of answers, or by static electricity altering the memory contents. Try the AC (all clear) button, power on/off, removing and re-installing all batteries, using a straightened paper clip to depress the reset button (usually on the back of the calculator)
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A Casio FX-88OP is a scientific calculator. To program this, simply run the program in the true MS-DOS mode. Do not use an MS-DOS prompt.
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Yes.
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