diff --git a/LEGO1/omni/include/mxdisplaysurface.h b/LEGO1/omni/include/mxdisplaysurface.h
index a6925e3d..eb5d9ea3 100644
--- a/LEGO1/omni/include/mxdisplaysurface.h
+++ b/LEGO1/omni/include/mxdisplaysurface.h
@@ -66,13 +66,13 @@ class MxDisplaySurface : public MxCore {
 		MxS32 p_height,
 		MxBool p_RLE
 	); // vtable+0x30
-	virtual undefined4 VTable0x34(
-		undefined4,
-		undefined4,
-		undefined4,
-		undefined4,
-		undefined4,
-		undefined4
+	virtual void VTable0x34(
+		MxU8* p_pixels,
+		MxS32 p_bpp,
+		MxS32 p_width,
+		MxS32 p_height,
+		MxS32 p_x,
+		MxS32 p_y
 	); // vtable+0x34
 	virtual void Display(
 		MxS32 p_left,
diff --git a/LEGO1/omni/src/video/mxdisplaysurface.cpp b/LEGO1/omni/src/video/mxdisplaysurface.cpp
index 2d179d01..d88038bd 100644
--- a/LEGO1/omni/src/video/mxdisplaysurface.cpp
+++ b/LEGO1/omni/src/video/mxdisplaysurface.cpp
@@ -739,10 +739,66 @@ void MxDisplaySurface::DrawTransparentRLE(
 	}
 }
 
-// STUB: LEGO1 0x100bb850
-undefined4 MxDisplaySurface::VTable0x34(undefined4, undefined4, undefined4, undefined4, undefined4, undefined4)
+// FUNCTION: LEGO1 0x100bb850
+void MxDisplaySurface::VTable0x34(MxU8 *p_pixels, MxS32 p_bpp, MxS32 p_width, MxS32 p_height, MxS32 p_x, MxS32 p_y)
 {
-	return 0;
+    DDSURFACEDESC surfaceDesc;
+    memset(&surfaceDesc, 0, sizeof(surfaceDesc));
+    surfaceDesc.dwSize = sizeof(surfaceDesc);
+    HRESULT result = m_ddSurface2->Lock(NULL, &surfaceDesc, DDLOCK_WAIT, NULL);
+    if (result == DDERR_SURFACELOST) {
+        m_ddSurface2->Restore();
+        result = m_ddSurface2->Lock(NULL, &surfaceDesc, DDLOCK_WAIT, NULL);
+    }
+    if (result != DD_OK) {
+        return;
+    }
+    int dst_bitcount = m_surfaceDesc.ddpfPixelFormat.dwRGBBitCount;
+    switch (dst_bitcount) {
+    case 8:
+        if (p_bpp == 16) {
+            // BUG: should go to end of function and unlock m_ddSurface2
+            return;
+        } else {
+            MxU8 *dst = (MxU8 *)surfaceDesc.lpSurface + p_y * surfaceDesc.lPitch + p_x;
+            MxU8 *src = p_pixels;
+            while (p_height != 0) {
+                p_height--;
+                memcpy(dst, src, p_width);
+                src += p_width;
+                dst += surfaceDesc.lPitch;
+            }
+        }
+        break;
+    case 16:
+        switch (p_bpp) {
+        case 16: {
+            MxU8 *dst = (MxU8 *)surfaceDesc.lpSurface + p_y * surfaceDesc.lPitch + 2 * p_x;
+            MxU8 *src = p_pixels;
+            while (p_height != 0) {
+                p_height--;
+                memcpy(dst, src, 2 * p_width);
+                src += 2 * p_width;
+                dst += surfaceDesc.lPitch;
+            }
+            break;
+        }
+        case 8: {
+            MxU8 *dst = (MxU8 *)surfaceDesc.lpSurface + p_y * surfaceDesc.lPitch + 2 * p_x;
+            MxU8 *src = p_pixels;
+            for (MxS32 i = 0; i < p_height; src += p_width, dst += surfaceDesc.lPitch, i++) {
+                for (MxS32 j = 0; j < p_width; dst += 2, src += 1, j++) {
+                    *(MxU16 *) dst = m_16bitPal[*src];
+                }
+            }
+            break;
+        }
+        default:
+            break;
+        }
+        break;
+    }
+    m_ddSurface2->Unlock(surfaceDesc.lpSurface);
 }
 
 // FUNCTION: LEGO1 0x100bba50