>
> On Feb 9, 2010, at 10:06 AM, Peter wrote:
>
> ---snip---
>
> I could recently prove myself this fact with a USB to RS232 adapter  
> which has a
> TX LED. The cable appeared to be dead due to interface  
> incompatibility but then
> i opened a terminal and sent spaces or other characters and could  
> see the LED
> blip once per character, very faintly. I later realized that the  
> baud rate was
> 256kBauds or higher and that the LED had been on for a ridiculously  
> short amount
> of time. I confirmed this switching to 300Bauds and there the LED  
> made fat wide
> pulses.
>
>
> ---snip---
>  Peter

Were you able to discern color when looking at the 256kBaud blip ?    
Is it a rods and cones issue in the human eye ?
Gus
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