> There seemed no way to absolutely, positively prevent
> these three problems from occurring, so I gave up on
> this approach

Well, I'll defer to your investigations. Personally I think I'd
keep the two functions separate and use either a shift
register for the LCD to free up more lines for the k/b, or
use k/b decoding h/w to free up more lines for the LCD.
The other alternative would be to keep RS R/W and E
entirely separate from any k/b lines. There will be many
ways to accomplish this using h/w and s/w permutations

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