diff --git a/src/sys/graphics/main.cpp b/src/sys/graphics/main.cpp
index 75a2a95..1add3a3 100755
--- a/src/sys/graphics/main.cpp
+++ b/src/sys/graphics/main.cpp
@@ -6,7 +6,10 @@
   TGfx0* buf=0;
   buf = new TGfx0();
   pixfmt.BPP=8;
-  buf->create(400,400,&pixfmt);
+  buf->create(400,400,def_pixfmt_16bpp);
+  cout << def_pixfmt_16bpp.BPP << endl;
+  cout << buf->BPP << endl;
+  cout << buf->RedShifter << endl;
   if (buf) delete buf;
   return(0);
 }
diff --git a/src/sys/graphics/objgfx30.cpp b/src/sys/graphics/objgfx30.cpp
index 0b0bd14..7b10e7b 100755
--- a/src/sys/graphics/objgfx30.cpp
+++ b/src/sys/graphics/objgfx30.cpp
@@ -3,7 +3,7 @@
 
 // TGfx0 constructor
 
-TGfx0::TGfx0() {
+TGfx0::TGfx0(void) {
   DataState = og_None;
   Buffer = 0;
   LineOfs = 0;
@@ -26,7 +26,7 @@
 } // TGfx0::TGfx0()
 
 
-bool TGfx0::create(UInt32 _xRes, UInt32 _yRes, TPixelFmt* _pixformat) {
+bool TGfx0::create(UInt32 _xRes, UInt32 _yRes,TPixelFmt* _pixformat) {
   UInt32 yy;
   if (DataState==og_Owner) {
     if (Buffer) free(Buffer);
@@ -62,15 +62,15 @@
   return TRUE;
 } // TGfx0::create
 
-UInt32 TGfx0::getMaxX() {
+UInt32 TGfx0::getMaxX(void) {
   return MaxX;
 } // TGfx0::getMaxX
 
-UInt32 TGfx0::getMaxY() {
+UInt32 TGfx0::getMaxY(void) {
   return MaxY;
 } // TGfx0::getMaxY
 
-TGfx0::~TGfx0() {
+TGfx0::~TGfx0(void) {
   if (DataState == og_Owner) {
     if (pal) free(pal);
     if (Buffer) free(Buffer);
diff --git a/src/sys/graphics/objgfx30.h b/src/sys/graphics/objgfx30.h
index af74031..1f5f571 100755
--- a/src/sys/graphics/objgfx30.h
+++ b/src/sys/graphics/objgfx30.h
@@ -106,9 +106,16 @@
           UInt8 GreenMaskSize;
         } TPixelFmt;
 
+// Default pixel formats
+
+const TPixelFmt def_pixfmt_8bpp  = {8,0,0,0,0,0,0};
+const TPixelFmt def_pixfmt_15bpp = {15,10,5,0,5,5,5};
+const TPixelFmt def_pixfmt_16bpp = {16,11,5,0,5,6,5};
+const TPixelFmt def_pixfmt_24bpp = {24,16,8,0,8,8,8};
+const TPixelFmt def_pixfmt_32bpp = {32,16,8,0,8,8,8};
+
 class TGfx0 {
         public:
-          // owner
           TGfx0*  Owner;
 	  void*   Buffer;
           UInt32* LineOfs;
@@ -127,11 +134,11 @@
           UInt8   GreenShifter;
           UInt8   BlueShifter;
         public:
-          TGfx0();
-          bool create(UInt32, UInt32, TPixelFmt*);
-          UInt32 getMaxX();
-          UInt32 getMaxY();
-          ~TGfx0();
+          TGfx0(void);
+          bool create(UInt32, UInt32,TPixelFmt*);
+          UInt32 getMaxX(void);
+          UInt32 getMaxY(void);
+          ~TGfx0(void);
       }; // gfx0
 
 #endif