[dcb]

lcd_gotoXY probably needs a tweak for 4x20 to get the lcd addressing right, here is the original 2x16 version
/*
* LCD functions
*/
// x=0..16, y=0..1
void lcd_gotoXY(byte x, byte y)
{
byte dr=0x80+x;
if(y!=0) // save 2 bytes compared to "if(y==1)"
dr+=0x40;
lcd_commandWrite(dr);
}