> Can this equation be done on a 16F84? How about an HC11?
>
> The equation is at http://sura1.jlab.org/~grippo/etmphcorr_f.html
>
> The actual equation is at the bottom of the page.
>

(Equation follows):

cfet = 0.9986 + 0.0095 * (CorrBaro - 29.1) - 0.0002556*(Temp - 35.0)
cfmph = 1.0003525 - 0.00975 * (CorrBaro - 29.1) + 0.0002667*(Temp - 35.0)

For Correction TO Standard:
    Et = EtOld * cfet
    Mph = MphOld * cfmph

For Correction FROM Standard:
    Et = EtOld / cfet
    Mph = MphOld / cfmph

<$0.02>

Sure.  I wouldn't do it in assembly though... unless you really enjoy
spending inordinate amounts of time being clever.  I would suggest
downloading one of these fine free PIC C compilers and generating output
from that.

http://www.geocities.com/SiliconValley/Network/3656/c2c/c.html
http://www.bknd.com/cc5x/index.shtml

</$0.02>

-d