Citizen SRP-80
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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Citizen SRP-80
Yet another programmable Citizen calculator that's a surprise. It was only recently, that I discovered my first Citizen programmable, the SR-59; and now here's another, a folding machine with a much greater memory capacity, but a similar programming model.
The SRP-80 offers four program areas and a 128-step program storage capacity. Unfortunately, programs cannot be viewed or edited; this makes the task of developing and debugging programs more difficult than need be.
Like the SR-59, the SRP-80 also uses relative addresses for its conditional and unconditional jump capability. Instructions such as GOTO or X>0 can transfer control to a program step within plus or minus nine steps of the current program location. If you're writing programs with conditional jumps, you're well advised to write them on paper first; ad-hoc programming is almost impossible with this programming model.
Still, 128 program steps is a fair amount, and full memory arithmetic (even if the keystrokes are unmerged) is also a great plus. This is a capable little machine. To demonstrate, I adapted a program I wrote for the SR-59, an implementation of the incomplete Gamma function. To use this program, you need to enter the integration limit into memory register 0 (aka. M), key in an argument and leave it on the display, and then press, say, RUN 6 (if you stored this program under LRN1.) Unlike the SR-59 version, this program preserves the integration limit in register 0, so the incomplete Gamma function can be easily evaluated for subsequent arguments. If you use a large enough integration limit in order to calculate the true Gamma function, the integration limit only needs to be keyed in once.
01: STO 02: 2 03: RCL 04: 0 05: STO 06: 1 07: yx 08: RCL 09: 2 10: ÷ 11: RCL 12: 1 13: ex 14: ÷ 15: RCL 16: 2 17: = 18: STO 19: 3 20: STO 21: 0 22: 1 23: STO 24: + 25: 2 26: RCL 27: 1 28: GOTO 1 29: GOTO -9 30: ÷ 31: RCL 32: 2 33: × 34: RCL 35: 3 36: GOTO 1 37: GOTO -8 38: + 39: STO 40: 3 41: RCL 42: 0 43: = 44: x<=M 1 45: GOTO -8 46: RCL 47: 1 48: x<->M