[sdiy] math question - somewhat OT

[Edu Silva]

Hi all



Oren Leavitt wrote:
> 
> I bought an HP15C back in 1983 and became an RPN geek. I still have it
> today and it works great.
 


Mine too. And I had to replace the original batteries two years ago!!

http://hp15c.org/hp15c.php

I have an older TI SR-51A (1975/76, I think) but is doesn't works
anymore. :-(  Maybe it's just the NiCad that went bad, I have to check
someday.

http://www.datamath.org/Sci/WEDGE/sr-51a.htm

Also, a Facit CI-13 manual calculator...

http://www.xnumber.com/xnumber/facit_history.htm

...and some nice slide rules too. :-)

http://www.hpmuseum.org/sliderul.htm

(no, I'm not that old, they were from my father...)


-- 
abraços,

Edu Silva
ES2 Audio
Brasil

http://audiolist.cjb.net