diff --git a/src/samplesrc/dgrtest.pla b/src/samplesrc/dgrtest.pla
new file mode 100644
index 0000000..542bfdf
--- /dev/null
+++ b/src/samplesrc/dgrtest.pla
@@ -0,0 +1,64 @@
+import dgr
+	word[] dgrbuff
+	predef drgPlot, dgrHLin, dgrVLin, dgrBLT, dgrTile, dgrTileStr, dgrFill
+	predef dgrMode, txtMode, dgrShow, dgrColor, dgrLine, dgrClear
+end
+
+byte[] sprite1 = $0,$0,$5,$5,$5,$5,$0,$0
+byte[]         = $0,$5,$A,$A,$A,$A,$5,$0
+byte[]         = $5,$A,$F,$F,$F,$F,$A,$5
+byte[]         = $5,$A,$F,$0,$0,$F,$A,$5
+byte[]         = $5,$A,$F,$0,$0,$F,$A,$5
+byte[]         = $5,$A,$F,$F,$F,$F,$A,$5
+byte[]         = $0,$5,$A,$A,$A,$A,$5,$0
+byte[]         = $0,$0,$5,$5,$5,$5,$0,$0
+
+byte[] tile1 = $88,$11,$88,$11,$88,$11,$AA,$00
+byte[]       = $88,$11,$88,$11,$88,$11,$AA,$00
+byte[]       = $88,$11,$88,$11,$88,$11,$AA,$00
+byte[]       = $0A,$05,$0A,$05,$0A,$05,$0A,$00
+
+//
+// Test routine
+//
+def dgrTest
+	byte b, l, k
+	word i, j, ii, ij
+	
+	b = dgrMode
+	for k = 15 downto 0
+		dgrClear(dgrbuff[0], k)
+	next
+	for l = 0 to 79
+		dgrColor(l)
+		dgrLine(dgrbuff[0], 0, 0, l, 47)
+	next
+	for l = 47 downto 0
+		dgrColor(l)
+		dgrLine(dgrbuff[0], 0, 0, 79, l)
+	next
+	ii = 2
+	ij = -1
+	i = 40
+	j = 10
+	^$C010
+	while ^$C000 < 128
+		dgrFill(dgrbuff[b], k, k, @tile1)
+		dgrBLT(dgrbuff[b], i, j, 8, 8, @sprite1)
+		b = dgrShow(b)
+		k++
+		i = i + ii
+		if i < -3 or i > 75
+			ii = -ii
+		fin
+		j = j + ij
+		if j < -3 or j > 43
+			ij = -ij
+		fin
+	loop
+	^$C010
+	txtMode
+end
+
+dgrTest
+done
\ No newline at end of file