--- hatari/src/includes/vdi.h	2019/04/09 08:49:36	1.1.1.7
+++ hatari/src/includes/vdi.h	2019/04/09 08:53:20	1.1.1.10
@@ -1,22 +1,36 @@
 /*
   Hatari - vdi.h
 
-  This file is distributed under the GNU Public License, version 2. or at
-  your option any later version. Read the file gpl.txt for details.
+  This file is distributed under the GNU General Public License, version 2
+  or at your option any later version. Read the file gpl.txt for details.
 */
 
 #ifndef HATARI_VDI_H
 #define HATARI_VDI_H
 
 #define MAX_VDI_PLANES  4
-/* TOS needs width to be aligned to 128/planes and height to VDI text
- * height (16 in 1-plane mode, 8 otherwise).   Use TT hi-res as max
- * (max size affects memory usage).
+/* TOS needs screen width to be aligned to 128/planes and height to VDI text
+ * height (16, larger of these, is used in calculating the limits in Hatari).
+ * Max. screen size supported by EmuTOS (and TOS v3.x?) is 300kB.
+ *
+ * Below MAX_VDI_* values are reasonable limits for monochrome resolutions.
+ * 300kB limits screen size to max. resolution of 2048x1200 or 1920x1280,
+ * which allows FHD (1920×1080), WUXGA (1920x1200) and QWXGA (2048x1152)
+ * standard resolutions.
+ * 
+ * On 4-color mode, 300kB limits screen size to 1280x960 or 1200x1024
+ * which allows HD (1280x720), WXGA (1280x768) and XGA+ (1152x864)
+ * standard resolutions.
+ * 
+ * On 16-color mode, 300kB limits screen size to 1024x576 or 800x768,
+ * which fills nicely qHD (960x540), DVGA (960x640) and WSVGA (1024x600)
+ * standard resolution displays.
  */
-#define MAX_VDI_WIDTH  1280
-#define MAX_VDI_HEIGHT  960
-/* next in-all-bitdepths aligned size up from smallest ST res. */
-#define MIN_VDI_WIDTH   384
+#define MAX_VDI_BYTES 300*1024
+#define MAX_VDI_WIDTH  2048
+#define MAX_VDI_HEIGHT 1280
+/* smaller doesn't make sense even for testing */
+#define MIN_VDI_WIDTH   320
 #define MIN_VDI_HEIGHT  208
 
 
@@ -39,5 +53,6 @@ extern void VDI_Info(Uint32 bShowOpcodes
 extern bool VDI_AES_Entry(void);
 extern void VDI_LineA(Uint32 LineABase, Uint32 FontBase);
 extern void VDI_Complete(void);
+extern void VDI_Reset(void);
 
 #endif  /* HATARI_VDI_H */