Citizen SRP-265
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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The Citizen SRP-265 is a fine scientific calculator even if it is a somewhat boring one: a plain scientific machine with 40 program steps, no branching or conditionals, and only a standard set of scientific functions.
For me, however, this calculator is special. In this case, the reason is not sentimental: not some fond memory from 25 years ago when I was trying to decide what was more important, programmable calculators or members of the opposite sex. No, the SRP-265 is special because it happens to be the very first calculator for which I implemented the automatic generation of a Web page. You see, much of the page you're reading right now, in fact the entire top part (the "Datasheet") is now machine-generated from a fine MySQL database. If I find that it works reliably, all other calculator pages will be similarly updated in the near future.
As for the SRP-265, there's not much more to say. It is hard to write an exciting description about a machine that, despite its elegant appearance, is really just a boring standard scientific calculator with minimal programmability. Instead, here's a simple implementation of the Gamma function using Stirling's approximation to demonstrate this machine's programming model:
x-M 1 M+ ÷ MR ÷ 1 2 + 1 = × MR xy MR ÷ MR ex × ( 2 × π ÷ MR ) √ =