Casio FX-601P
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 FX-601P is one of the most sophisticated programmable calculators from the early LCD era. Coming out on the heels of machines like the legendary HP-41C, it represented a cheaper, yet meaningful alternative to many students and engineers who wished to have a quality instrument at their disposal.
Functionally identical to the FX-602P except for its smaller memory capacity and lack of ability to "partition" memory, the FX-601P has a comprehensive programming model that includes conditionals, subroutines, labels, and even indirect addressing. Its 112-step program memory is a bit cramped, but a fully merged programming model nevertheless provides enough space for relatively sophisticated algorithms to be implemented. Alas, the FX-601P is no longer designed to generate musical tones like its earlier cousin, the FX-501P. However, the calculator's alphanumeric capabilities, including its ability to display program code in mnemonic form, should be more than adequate compensation.
The Gamma function remains my favorite example for programmable calculators. Non-trivial yet simple enough to be implemented on most calculators, it is also a very important mathematical function, used in many statistical calculations, yet it is typically omitted from all but the most sophisticated scientific handhelds.
The following 82-step program neatly demonstrates the calculator's programming model, as it calculates the natural logarithm of the Gamma function for all real arguments to 10+ digits of precision:
001 Min0 002 1 003 Min1 004 5 005 MinF 006 LBL1 007 MR0 008 x>=F 009 GOTO2 010 MR0 011 × 012 MR1 013 = 014 Min1 015 1 016 M+0 017 GOTO1 018 LBL2 019 MR0 020 × 021 ln 022 - 023 MR0 024 + 025 ( 026 2 027 × 028 π 029 ÷ 030 MR0 031 ) 032 √ 033 ln 034 + 035 ( 036 ( 037 ( 038 ( 039 9 040 9 041 1/x 042 ÷ 043 MR0 044 x2 045 - 046 1 047 4 048 0 049 1/x 050 ) 051 ÷ 052 MR0 053 x2 054 + 055 1 056 0 057 5 058 1/x 059 ) 060 ÷ 061 MR0 062 x2 063 - 064 3 065 0 066 1/x 067 ) 068 ÷ 069 MR0 070 x2 071 + 072 1 073 ) 074 ÷ 075 1 076 2 077 ÷ 078 MR00 079 - 080 MR01 081 ln 082 =