diff --git a/src/sys/graphics/main.cpp b/src/sys/graphics/main.cpp
index 4608d35..4a5119d 100755
--- a/src/sys/graphics/main.cpp
+++ b/src/sys/graphics/main.cpp
@@ -24,18 +24,16 @@
   buf = new TGfx0();
   buf2 = new TGfx0();
   font = new TDPFont();
-  buf->create(400,400,def_pixfmt_32bpp);
+  buf->create(400,400,def_pixfmt_8bpp);
+  buf->setRGBPalette(1,255,255,255);
 //  buf2->create(400,400,def_pixfmt_15bpp);
-//  buf2->alias(*buf,0,3,8,8);
-  buf2->clone(*buf);
-  buf2->putPixel(0,0,1);
-  buf2->putPixel(buf2->getMaxX(),buf2->getMaxY(),1);
-  buf2->clear(1);
-  result = font->load("PACMAN.DPF");
+  buf2->alias(*buf,0,0,39,7);
+//  buf2->clone(*buf);
+  result = font->load("OLDENG.DPF");
   font->setColor(255,255,255);
-  font->putText(*buf,0,0,"     World");
- // buf->copyBuf(0,0,*buf,40,0,79,8);
-  buf->rectangle(0,0,15,7,1);
+  font->putText(*buf,0,0,"HelloWorld");
+//  buf->copyBuf(0,0,*buf,40,0,79,8);
+  buf2->hFlip();
   for (r=0; r<8; r++) {
     for (g=0; g<80; g++)
       if (buf->getPixel(g,r)) printf("*"); else printf(" ");
diff --git a/src/sys/graphics/objgfx30.cpp b/src/sys/graphics/objgfx30.cpp
index 80c0e92..c1a7787 100755
--- a/src/sys/graphics/objgfx30.cpp
+++ b/src/sys/graphics/objgfx30.cpp
@@ -589,7 +589,7 @@
   UInt32 result;
   result = 42;
   if ((Buffer==NULL) || (LineOfs==NULL)) return TransparentColor;
-  if ((x<0) || (x>(Int32)MaxX) || (y<0) || y>(Int32)MaxY) 
+  if (((UInt32)x>MaxX) || ((UInt32)y>MaxY)) 
     return TransparentColor;
   switch (BPP) {
   case 8:
@@ -669,7 +669,21 @@
 
 void
 TGfx0::hFlip(void) {
-
+  void * tmpBuf;
+  UInt32 xWidth, count;
+  if ((Buffer==NULL) || (LineOfs==NULL)) return;
+  xWidth = (MaxX+1)*((BPP+7) >> 3);
+  tmpBuf = malloc(xWidth);
+  if (tmpBuf == NULL) return;
+  for (count=0; count<=(MaxY/2); count++) {
+    memcpy(tmpBuf,((char*)Buffer+LineOfs[count]),xWidth); 
+    memcpy(((char*)Buffer+LineOfs[count]),
+           ((char*)Buffer+LineOfs[MaxY-count]),
+           xWidth);
+    memcpy(((char*)Buffer+LineOfs[MaxY-count]),tmpBuf,xWidth);
+  } // for
+  free(tmpBuf);
+  return;
 } // TGfx0::hFlip
 
 void
@@ -799,7 +813,7 @@
 void 
 TGfx0::putPixel(UInt32 x, UInt32 y, UInt32 colour) {
   if ((Buffer==NULL) || (LineOfs==NULL)) return;
-  if ((x<0) || (x>MaxX) || (y<0) || y>MaxY) return;
+  if (((UInt32)x>MaxX) || ((UInt32)y>MaxY)) return;
   switch (BPP) {
   case 8:
     asm(