John Coppens wrote:
> Color blindness can take several forms (see
> http://en.wikipedia.org/wiki/Color_blindness - very well-done article).

Yes, I've read the article too. Very well done, indeed.

> I suspect that category of afflicted people would detect small variations
> by mixing red (getting yellow) as huge changes. But that wouldn't do for
> normal observers. 

Not sure what you mean. 

> I would suggest you use on/off patterns to indicate errors.

Not an option for current design (hardware logic).

Vitaliy
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