MAX_SCREEN_X
(((chr - ' ') % (MAX_SCREEN_X/CHAR_WIDTH)) * CHAR_WIDTH);
(((chr - ' ')/(MAX_SCREEN_X/CHAR_WIDTH)) + 1);
adder->x_limit = MAX_SCREEN_X;
#if FONT_WIDTH > MAX_SCREEN_X
adder->fast_dest_dx = MAX_SCREEN_X;
max_chars_line = MAX_SCREEN_X/(CHAR_WIDTH*2);
#define FONT_OFFSET ((MAX_SCREEN_X/CHAR_WIDTH)*CHAR_HEIGHT)
max_chars_line = MAX_SCREEN_X/(CHAR_WIDTH*2);
if (max_chars_line > (MAX_SCREEN_X/(CHAR_WIDTH*2)))
max_chars_line = MAX_SCREEN_X/(CHAR_WIDTH*2);