Thanks for the great info on the backlight.

Does anyone have some info/ASM code on fan speed checking?
I need to use the 'third wire' of a PC type fan to check the RPM.

I *think* it's just a matter of checking the line for X mS for ground 
pulses, then calculate how many pulses per minute that would equate. For 
example, if I check it for 100 mS, and I see 5 pulses, that would be 5 x 
600, or 3000 RPM. The 600 multiplier came from 1 minute = 600 x 100 mS.

Does anyone know if this is how this third wire works? (ground pulses)

and if so does this sound correct for how to calculate the RPM?

Thanks again,
Joe M.
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