--- hatari/src/includes/screen.h	2019/04/01 07:12:37	1.1.1.9
+++ hatari/src/includes/screen.h	2019/04/01 07:13:05	1.1.1.10
@@ -11,6 +11,23 @@
 #include <SDL_video.h>    /* for SDL_Surface */
 
 
+/* Assumes 32 pixels left+right */
+#define SCREENBYTES_LEFT    16          /* Bytes for left border in ST screen */
+#define SCREENBYTES_MIDDLE  160         /* Middle (320 pixels) */
+#define SCREENBYTES_RIGHT   16          /* right border */
+#define SCREENBYTES_LINE    (SCREENBYTES_LEFT+SCREENBYTES_MIDDLE+SCREENBYTES_RIGHT)
+#define SCREENBYTES_MONOLINE 80         /* Byte per line in ST-high resolution */
+
+/* Overscan values */
+#define OVERSCAN_LEFT       (SCREENBYTES_LEFT*2)    /* Number of pixels in each border */
+#define OVERSCAN_RIGHT      (SCREENBYTES_RIGHT*2)
+#define OVERSCAN_TOP        29
+#define OVERSCAN_BOTTOM     47
+
+/* Number of visible screen lines including top/bottom borders */
+#define NUM_VISIBLE_LINES  (OVERSCAN_TOP+200+OVERSCAN_BOTTOM)
+
+
 /* Frame buffer, used to store details in screen conversion */
 typedef struct
 {