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
Years of production:   Display type: 7-segment + alphanumeric
New price:  
Display color: Black
    Display technology: LCD
Size: 1.5"×1.5"×0.25" Display size: 8+2 digits
Weight: 3 oz    
    Entry method: Algebraic
Batteries: 1×"BR-2020" ("CR-2016") Advanced functions: Trig Exp Cmem RTC
External power: N/A
Memory functions: M+, M-
I/O: N/A    
    Programming model: N/A
Precision: 10 digits Program functions: N/A
Memories: 1
Program display: N/A
Program memory: N/A
Program editing: N/A
Chipset:   Forensic result: 8.99980885 


It is 2016 and I do not often purchase calculators anymore.

Those that were easy to obtain, I obtained. Those that are hard to obtain... well, I obtained most of them anyway. A few will probably be permanently missing, as they are getting harder and harder to find, especially at a reasonable price.

For the longest time, the Casio CFX-200 and its cousin, the CFX-400 fell into this category. Though they tended to show up on eBay from time to time, prices were exorbitant.

Today, however, I was able to purchase a CFX-200 for a more reasonable sum, and I decided to go for it.

So here we are. And what a beauty of a watch this is!

Oh, did I say watch? The CFX-200 is a calculator watch. But it is almost unique (again, with the CFX-400 being the only other one of its kind) in that it is a scientific calculator watch.

To be sure, it is not a programmable calculator. As such, it is not part of this museum's "main exhibit". But its beauty and uniqueness warrant it to have a page, so here it is.

I can see why this model was discontinued. You almost need a magnifying glass to use it, and teeny weeny fingers (or sharp nails). And its usage is somewhat cumbersome.

Nonetheless... it is, in many ways, the ultimate geek watch. In addition, it actually looks nice (even with more than 20 years of obvious wear) and it's light and a pleasure to wear. Though apparently, finding a replacement battery can be a problem, as the BR-2020 battery type is obsolete. (But then, the standard CR-2016 type appears to be a perfect substitute.)

I already like this watch so much, I think I might actually wear it... on those rare occasions when I still wear a watch (maybe once in a leap year or so) instead of just using my smartphone to get the time.

I think in this case, the expression "they just don't make them like this anymore" is truly appropriate. I am glad I was able to get one of these units and feature it here.