Hi,

If a LCD is 4 lines by 20 characters and we turn the contrast way up, do we get:

- 1 line contrast squares, 1 line blank, 1 line contrast squares, 1 line blank.

or

- 4 lines contrast squares.

It looks like I'm as successful getting this CASIL CCM-2040CSL v2.0 LCD going as I was getting registers shifting.

What is the difference between using a 4 bit bus vs an 8 bit bus? I am trying to use 8 bits 'cause, well I have them. I figured that 8 bits would either give faster communication or some other advantage.

I am running this on a 16F628 at 20MHz.

Robert