Knight K-31A
Datasheet legend
Ab/c:
Fractions calculation
AC: Alternating current BaseN: Number base calculations Card: Magnetic card storage Cmem: Continuous memory Cond: Conditional execution Const: Scientific constants Cplx: Complex number arithmetic DC: Direct current Eqlib: Equation library Exp: Exponential/logarithmic functions Fin: Financial functions Grph: Graphing capability Hyp: Hyperbolic functions Ind: Indirect addressing Intg: Numerical integration Jump: Unconditional jump (GOTO) Lbl: Program labels LCD: Liquid Crystal Display LED: Light-Emitting Diode Li-ion: Lithium-ion rechargeable battery Lreg: Linear regression (2-variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: Nickel-Cadmium rechargeable battery NiMH: Nickel-metal-hydrite rechargeable battery Prnt: Printer RTC: Real-time clock Sdev: Standard deviation (1-variable statistics) Solv: Equation solver Subr: Subroutine call capability Symb: Symbolic computing Tape: Magnetic tape storage Trig: Trigonometric functions Units: Unit conversions VAC: Volts AC VDC: Volts DC |
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Knight K-31A
The Knight K-31A calculator is yet another OEM/store label that uses the Sharp LI3301A calculator integrated circuit. I already have at least thirteen models, from over ten different manufacturers in my possession, all using this chip, making it probably the most popular programmable calculator circuit on the market.
The limited programming model of this machine makes it impossible to implement complex algorithms. A sophisticated Gamma function implementation is therefore beyond the machine's capabilities, but Stirling's formula fits easily into the calculator's memory:
x-M 1 M+ ÷ RM ÷ 1 2 + 1 = × RM yx RM ÷ RM ex × ( 2 × π ÷ RM ) √ =