diff --git a/VirtualComputer/src/sznp/virtualcomputer/PXCLib.java b/VirtualComputer/src/sznp/virtualcomputer/PXCLib.java
index eb373a1..dc62f5a 100644
--- a/VirtualComputer/src/sznp/virtualcomputer/PXCLib.java
+++ b/VirtualComputer/src/sznp/virtualcomputer/PXCLib.java
@@ -1,5 +1,27 @@
 package sznp.virtualcomputer;
 
 public interface PXCLib {
+	/**
+	 * Testing only
+	 * @param px Input array
+	 * @param out Output array
+	 * @return 0
+	 */
 	int convert(int[] px, long[] out);
+
+	/**
+	 * Set source bitmap
+	 * @param address Bitmap address from VirtualBox
+	 * @param w Width of the screen
+	 * @param h Height of the screen
+	 * @param mc Total count of maps used for the screen
+	 */
+	void setSource(long address, int w, int h, int mc);
+
+	/**
+	 * Updates map and returns it's content
+	 * @param mapnum Number of the map (0 is first)
+	 * @return Address of the map data
+	 */
+	long updateAndGetMap(short mapnum); //TODO: Only update parts that actually updated and return them per-map (flagDirty)
 }
diff --git a/VirtualComputer/src/sznp/virtualcomputer/Test.java b/VirtualComputer/src/sznp/virtualcomputer/Test.java
index 6d6f171..28ce9de 100644
--- a/VirtualComputer/src/sznp/virtualcomputer/Test.java
+++ b/VirtualComputer/src/sznp/virtualcomputer/Test.java
@@ -14,6 +14,6 @@ public class Test {
 		ByteBuffer bb = ByteBuffer.allocateDirect(2);
 		long[] x = new long[]{Pointer.nativeValue(Native.getDirectBufferPointer(bb))};
 		pxc.convert(new int[]{5, 10}, x);
-		System.out.println(bb.get(0)); //19 AYY
+		System.out.println(bb.get(0)); //19 AYY //TO!DO: Use setSource, we don't want to wrap the native array
 	}
 }
diff --git a/libpxc/pxc.c b/libpxc/pxc.c
index bc47f53..fa067f9 100644
--- a/libpxc/pxc.c
+++ b/libpxc/pxc.c
@@ -1,13 +1,30 @@
 #include <stdio.h>
+#include <stdlib.h>
 
-typedef long long int lli;
+#define MAPSIZE 128
+
+typedef long long int addr;
 
 void* image=NULL;
+const void* maps=NULL; //Per map data (1st map, second map etc.)
 
-void setSource(lli address) {
+int width, height, mapc;
+
+void setSource(addr address, int w, int h, int mc) {
 	image=(void*)address;
+	maps=malloc(MAPSIZE*MAPSIZE*mc); //1 byte per pixel
+	width=w, height=h, mapc=mc;
 }
 
+//May return 0
+addr updateAndGetMap(short mapnum) {
+	if(mapnum<0||mapnum>=mapc) return 0; //Out of bounds
+	//TODO: Converter
+	//return (long)map+mapx*MAPSIZE + mapy*MAPSIZE*width; - not good, we need to order the data per map
+	return (long)maps + MAPSIZE*MAPSIZE*mapnum;
+}
+
+//Testing only
 int convert(int px[], int *out[]) {
 	printf("convert...\n");
 	printf("px0: %d\n", px[0]);