oups, the test software is below. Sorry for the bad copy & paste....

void Rrex1sec(void)
{
char pageAdr = 0xb8;

LCD_CS1=1;
LCD_CS2=0;
GLCD_LcdInstructionWrite(pageAdr);
GLCD_LcdInstructionWrite(0x40);
for (col = 0; col <= 63; col++)
GLCD_LcdDataWrite(col);


LCD_CS1=0;
LCD_CS2=1;
GLCD_LcdInstructionWrite(pageAdr);
GLCD_LcdInstructionWrite(0x40);
for (col = 64; col <= 127; col++)
GLCD_LcdDataWrite(col+63);

pageAdr++;
if (pageAdr==0xC0)
pageAdr=0xB8;
}