I still occasionally use the casio fx-451 calculator I used for work (circa 1986). Solar powered and still the best calculator I've used.

http://www.cantares.on.ca/muscalc/

The fx-451 was brilliant. Mine gave up the ghost long ago. I now have an fx-83W [spit]

Edited by micksharpe (Wed 08-Feb-12 14:15:59)

Just checked mine. Still working fine. What broke on yours?

In reply to a post by john2007:

Just checked mine. Still working fine. What broke on yours?

The spine and connectors, iirc - it's been a long time

Edited by micksharpe (Wed 08-Feb-12 14:31:31)

My abacus is still in fine working order even if the beads are a bit discoloured.

Ah yes, there is a slight split in my Casio's spine. I've been especially careful never to open beyond flat since.

I have got a couple of slide rules still. They were for school though, not work.

I've got, and still use, an HP 15C as featured in your link. They rightly say

One of the best calculators ever made

Quite a collector's item nowadays.

In reply to a post by john2007:

I have got a couple of slide rules still. They were for school though, not work.

Yep! Still got my British Thornton - very well-used at uni but not afterwards.

Calculators? Pah! Youngsters these days don't know they're born. We 'ad it tough.

P.S. We did use mechanical calculators - but only for sadistics.

I realised I was not cut out to be an entrepreneur when I started buying fellow pupil's slide rules to sell on to the lower years just as cheap as chips electronic calculators took off.