diff --git a/user_io.cpp b/user_io.cpp
index f195691..2b25ff8 100644
--- a/user_io.cpp
+++ b/user_io.cpp
@@ -2586,8 +2586,64 @@ static void setPLL(double Fout)
 	vitems[20] = k;
 }
 
+short scaler_coef[32][4] =
+{
+	{ -24,  176, -24,   0 },
+	{ -20,  174, -26,   0 },
+	{ -16,  169, -26,   1 },
+	{ -11,  160, -23,   2 },
+	{  -6,  147, -16,   3 },
+	{  -1,  129,  -4,   4 },
+	{   2,  109,  11,   6 },
+	{   5,   84,  32,   7 },
+	{   6,   58,  58,   6 },
+	{   7,   32,  84,   5 },
+	{   6,   11, 109,   2 },
+	{   4,   -4, 129,  -1 },
+	{   3,  -16, 147,  -6 },
+	{   2,  -23, 160, -11 },
+	{   1,  -26, 169, -16 },
+	{   0,  -26, 174, -20 },
+
+	{   0,  128,   0,   0 },
+	{  -4,  126,   6,   0 },
+	{  -8,  124,  13,  -1 },
+	{ -10,  119,  20,  -1 },
+	{ -11,  111,  30,  -2 },
+	{ -11,  103,  40,  -4 },
+	{ -10,   93,  50,  -5 },
+	{  -9,   82,  61,  -6 },
+	{  -8,   72,  72,  -8 },
+	{  -6,   61,  82,  -9 },
+	{  -5,   50,  93, -10 },
+	{  -4,   40, 103, -11 },
+	{  -2,   30, 111, -11 },
+	{  -1,   20, 119, -10 },
+	{  -1,   13, 124,  -8 },
+	{   0,    6, 126,  -4 }
+};
+
+static void setScaler()
+{
+	printf("*** Send Scaler parameters:\n");
+
+	spi_uio_cmd_cont(UIO_SET_VIPCOEF);
+	for (int i = 0; i < 32; i++)
+	{
+		for (int t = 0; t < 4; t++)
+		{
+			uint16_t data = (scaler_coef[i][t] & 0x1FF) | (((i * 4) + t) << 9);
+			printf("%d.%d.%d: %d\n", data >> 15, (data >> 11) & 0xF, (data >> 9) & 0x3, data & 0x1FF);
+			spi_w(data);
+		}
+	}
+	DisableIO();
+}
+
 static void setVideo()
 {
+	setScaler();
+
 	printf("Send HDMI parameters:\n");
 	spi_uio_cmd_cont(UIO_SET_VIDEO);
 	printf("video: ");
diff --git a/user_io.h b/user_io.h
index 12ed9d6..e8d13fb 100644
--- a/user_io.h
+++ b/user_io.h
@@ -62,6 +62,7 @@
 #define UIO_SETHEIGHT   0x27  // Set scaled vertical resolution (to reduce scaling artefacts)
 #define UIO_GETUARTFLG  0x28  // Get UART_FLG_*
 #define UIO_GET_STATUS  0x29  // Update status from the core
+#define UIO_SET_VIPCOEF 0x2A  // Set Scaler coefficients
 
 // codes as used by 8bit for file loading from OSD
 #define UIO_FILE_TX     0x53