240x64 Graphic LCD problem

[mkr]

Hello Everybody,
I am using an 240x64 Graphic LCD from displaytech model 64240a. My fonts are of size 16x9. I have allready written the LCD driver, but the problem is that I have one byte of the font written on the next Chip select.
What I mean is there are 4 CS for this LCD. When the byte is written at the 63 pixel where CS1 is selected and when the next byte is written it wrties it some where else, at this point CS2 is selected. Here is the example how the font 'I' looks like
-------
-
-
-
-
-
------ -

Can you see the last byte written some where. Can somebody assist with the code or some sample. The PIC I am using is 18F8722.
_________________
Thanks

mkr

[PCM programmer]

Here is the data sheet:
http://www.displaytech.com.hk/pdf/graphic/64240a%20series-v11.PDF
On page 6, it refers to the KS0108B as the controller chip.

You then look in the CCS drivers directory and find this:
c:\program files\picc\drivers\ks0108.c