void modexLeave();
page_t modexDefaultPage();
page_t modexNextPage(page_t *p);
-page_t modexNextPage0(page_t *p, word x, word y);
+page_t modexNextPageFlexibleSize(page_t *p, word x, word y);
void modexShowPage(page_t *page);
void modexPanPage(page_t *page, int dx, int dy);
void modexSelectPlane(byte plane);