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: LightEmitting Diode Liion: Lithiumion rechargeable battery Lreg: Linear regression (2variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: NickelCadmium rechargeable battery NiMH: Nickelmetalhydrite rechargeable battery Prnt: Printer RTC: Realtime clock Sdev: Standard deviation (1variable 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 


Here's another desktop calculator that doesn't really belong to my collection, were it not for the fact that its repair makes an interesting war story.
When this calculator arrived from the UK, it was slightly damaged: the screwposts of the printer assembly were ripped out of their plastic posts, and the printer assembly moved about. When I powered it up, nothing appeared on the calculator's display, and the printer motor was spinning continuously.
Naturally, I assumed that something might be wrong with the printer, so I disconnected it. This didn't solve the problem: the display remained blank and the calculator showed no signs of life. I was able to confirm that all voltages were correct and present, so it was not some obvious problem, like a bad power supply.
In an email, Mike Sebastian mentioned that he has seen calculators in the past with faulty printer assemblies whose display never came to life. So I decided to reexamine the printer, but still saw no damage or contamination that could cause any misbehavior. It was then that I noticed, however, that a capacitor near the printer connector was physically damaged, no doubt by the printer assembly itself during transport. After I replaced the capacitor, the calculator instantly came to life, and it is working perfectly.
So why would I want to get an old desktop calculator all the way from the UK anyway? Simple: it's a programmable calculator. Not very programmable, mind you: only 16 program steps, not a heck of a lot for a fourfunction machine. (I suppose back in the good ole' days, it was still useful to program a tax calculation or something.)
Using 10 of those 16 steps, it is possible to teach this calculator to do square roots. The following little program must be run repeatedly, until the result on the display no longer changes. The number the square root of which you wish to compute must first be placed in the calculator's memory:
01 + 02 / 03 MR 04 EXC 05 = 06 + 07 T 08 / 09 2 10 =