diff --git a/GeckoConverter/convert.ipynb b/GeckoConverter/convert.ipynb
index 8821abc..35ad5eb 100644
--- a/GeckoConverter/convert.ipynb
+++ b/GeckoConverter/convert.ipynb
@@ -115,8 +115,8 @@
     "# utility functions\n",
     "searchSymbol = lambda addr, lang: bsearch(symLsts[lang], addr, lambda sym: sym.addr)[1]\n",
     "def convertAddr(addr, src, dst, verbose=False):\n",
-    "  sym0 = searchSymbol(addr, dst)\n",
-    "  sym = symMaps[src][sym0.name]\n",
+    "  sym0 = searchSymbol(addr, src)\n",
+    "  sym = symMaps[dst][sym0.name]\n",
     "  addrN = addr-sym0.addr+sym.addr\n",
     "  if verbose:\n",
     "    print('%08x: %d + %s'%(addrN, addr-sym0.addr, sym))\n",
@@ -163,7 +163,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "8040a2a8: 0 + [8040a2a8] gpMarDirector (4)\n"
+      "804158dc: 0 + [804158dc] @2861 (6)\n"
      ]
     }
    ],
@@ -227,6 +227,7 @@
     "  @returns: converted code with type `(int, int)[]`\n",
     "  '''\n",
     "  insts = [x for p in code for x in p]\n",
+    "  # lis + lwz/lhz/lbz/ori\n",
     "  for i in range(1, len(insts)):\n",
     "    if insts[i-1]>>16 &0xfc1f == 15<<10:\n",
     "      '''\n",
@@ -260,6 +261,9 @@
     "        insts[i-1] = insts[i-1]&0xffff0000 | haN\n",
     "        insts[i] = insts[i]&0xffff0000 | loN\n",
     "        logger.info('%08x -> %08x %s'%(addr, addrN, s))\n",
+    "  # lwz/lhz/lbz r13/r2\n",
+    "  # TODO\n",
+    "  # DONE\n",
     "  return tuple(\n",
     "    tuple(insts[i:i+2])\n",
     "    for i in range(0, len(insts), 2)\n",
@@ -277,6 +281,12 @@
     "  ans = []\n",
     "  for code in gecko:\n",
     "    inst = code[0][0]\n",
+    "    # handle instruction that do not involves RAM\n",
+    "    ctype = inst>>24\n",
+    "    if ctype in [0xC0, 0xE0]: # TODO\n",
+    "      ans.append(code)\n",
+    "      continue\n",
+    "    # handle instruction that involves RAM\n",
     "    addr = 0x80000000|inst&0x1ffffff\n",
     "    sym0 = bsearch(srcSymLst, addr, lambda sym: sym.addr)[1]\n",
     "    instN = inst\n",
@@ -291,7 +301,7 @@
     "      sym = dstSymMap[sym0.name]\n",
     "      if sym.size != sym0.size:\n",
     "        logger.error(\n",
-    "          '%08X: function size different! (%d -> %d) %s',\n",
+    "          '%08X: different function size! (%d -> %d) %s',\n",
     "          inst, sym0.size, sym.size, sym.name,\n",
     "        )\n",
     "        continue\n",