Converts Fahrenheit to Celsius?

At 03:49 PM 5/19/04, you wrote:
>Here's an obscure bit of code I recently came up with.  See if you can
>figure out what it does without actually simulating it:
>
>         movwf temp
>         mullw .205
>         rlncf PRODH,w
>         andlw 0xF0
>         mullw .160
>         bsf STATUS,C
>         subfwb PRODH,w
>         addwf temp,w

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