for the bored...
List of Calculators
At least one of each general pocketable class, 1975..2000,
plus a few mechanicals.
Partial list of the electronic ones:
My favourite of all time is the HP-25, see my PC simulation of this on
my free software page.
- Sinclair Scientific  (gone) The first.
- Sinclair Cambridge  (gone) A kit!
- HP-25  (two of them, one a much later gift, both failed, both gone).
- LCD 4-function + timer + clock  (gone) First LCD.
- CBM 4-function LED  (gone) A classic LED calculator.
- Sinclair Cambridge Programmable  (still going, except key legends
wearing off!) 36 program steps, and
very clever keyboard logic .
- Texas TI-Programmer  (gone) First I ever saw with hex.
- Texas TI-10  (gone) My first LCD scientific.
- Sharp EL-827  Silly, plays tunes on the buttons (lost).
- Tandy PC-4 Basic language pocket computer  Still going.
- Casio fold-out 4-function solar  (gone) First cheap solar that I saw.
- American Express 4-function CC-sized solar  Neat.
- Texas TI-5020  Huge buttons, solar, += -= keys, good for money.
- Casio fx-115  Basic solar scientific.
- Sharp EL-504  (gone) Simple programmable, felt robust, failed
- Crystal Cal 8136  (gone) Cheap, with see-through keyboard.
- Casio fx-7000G  First graphical, good but heavily moded.
- Tandy 65-9002A Alarm Calendar  Hmm (failed).
- Casio fx-115d  Dual power, does complex but only on 4-functions, neat SI symbols for engineering multiples.
- Texas TI-68  Cheap, but does complex properly on all
functions, first I had that would answer sqrt(-1) correctly (failed).
- Texas TI-85  Superb machine, if a little messy, PC-link, and
no modes (lost in Buncefield explosion).
- Sharp EL-9300  Another 32k graphical, but not a patch on the
TI-85, heavily moded, no PC-link.
- Casio AZ-45F  A cheapie, notable for its special multi-segment
display for fractions, and its ability to convert decimals back to
fractions (display failed).
- Casio CFX-9850G  Another 32k graphical, with color display,
not as nice as the TI-85, but cute.
- Texas TI-30S  Excellent, tiny scientific for less than 5GBP.
Solar powered only, algebraic precedence on operators plus brackets and
simple stats. I've got two.
- Texas TI-36X  Solar scientific, cheap, but nasty. No formula
display or recall, and lots of keys labelled in blue which I can't read
- Casio fx-85WA  Dual-power cheapish workhorse, but no hex
conversion. Possibly around the cheapest with expression recall and edit.
- Texas TI-86  Just as good as the TI-85, but with four times the
RAM and a much clearer display, and only 15GBP in a clearance sale.
Will do factorial of non-integers.
- Hewlett Packard hp49g+  Amazing graphical. It does things like
simplifying algebraic expressions and symbolic integration. Just like the
HP-25, it can work in RPN (lost in Buncefield explosion, replaced 2006).
- Casio fx-85ES  Same old basic Casio, now with multiple line
recall and prettier all dot matrix display.
- Various "Texet" really cheap scientifics that I buy, keep in pockets,
Best now is the TI-85. The unofficial PC interface for this calculator
is at this site.
The Casio colour graphical comes close, it's just a pity about the dull
display, the quirky data organisation, and the limited range of complex
number functions. It also has a slight case of the mode disease.
I now have five graphicals, which have many similarities but also
are in their own ways quite different. Some time I'm going to write a
about the differences, though I admit it's not a subject of general
1998-10-25 .. 2009-01-16