HP-9S

CPU KI1724A
~LCD 10+2 7- Segment display
128 bytes ROM: 22k bytes
Alkaline battery, GP-76A x 2
2 year battery life
Auto power off
Four operation; add, subtract, multiply, divide
Hyperbolic, Inverse-hyperbolic
Polar. Rectangular coordinate
Power, Square/Cube root, Square
Reciprocal, Logarithmic & Exponential
Percentage, pi
Memory Calculation
10 digits for floating point display and 2 digits mantissa for exponential display
15-leven parentheses & 6 max number of pending operations
Variable statistics (with Cp, Cpk)
Friendly operation - Edit mode.
Memory protection while power off
Automatic power off
mutual conversions & calculation of binary, octal, decimal, and hexadecimal number Complex number mode
conversion and calculation in deg., rad., grad.
"Off" function
Time conversion
Decimal Point Selection
Probability (nPr, nCr, RND, X!)
6 metric conversions
Fraction calculation
Shift function
Clear and clear entry
Scientific display notation
Engineering notation
Internal 12 digits precision

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HP-10BII