diff --git a/src/marathon/wad.rs b/src/marathon/wad.rs
index 2715863..d317b3c 100644
--- a/src/marathon/wad.rs
+++ b/src/marathon/wad.rs
@@ -66,7 +66,7 @@ impl<'a> Wad<'a>
       4 => Ver::MI,
       2 => Ver::M2HasOvr,
       1 => Ver::M2HasDir,
-      0 => panic!("old wad type unsupported"), //Ver::M1,
+      0 => Ver::M1,
       _ => panic!("invalid wad version"),
       };
 
@@ -81,7 +81,7 @@ impl<'a> Wad<'a>
          let len =       b_u32b(&b[p+4..p+ 8]) as usize;
          let ind = if n {i as u16}
                    else {b_u16b(&b[p+8..p+10])};
-         let ent = Entry{map: get_chunks(&b[ofs..ofs+len]),
+         let ent = Entry{map: get_chunks(&b[ofs..ofs+len], n),
                          ext:            &b[p+h..p+h+ext]};
 
          map.insert(ind, ent);
@@ -95,10 +95,11 @@ impl<'a> Wad<'a>
    }
 }
 
-fn get_chunks(b: &[u8]) -> ChunkMap
+fn get_chunks(b: &[u8], n: bool) -> ChunkMap
 {
    let mut   p = 0;
    let mut map = ChunkMap::new();
+   let       h = if n {12} else {16};
 
    while p < b.len()
    {
@@ -106,8 +107,8 @@ fn get_chunks(b: &[u8]) -> ChunkMap
       // nx = b_u32b(&b[p+ 4..p+ 8]);
       let l = b_u32b(&b[p+ 8..p+12]) as usize;
       //  o = b_u32b(&b[p+12..p+16]);
-      map.insert(k,  &b[p+16..p+16+l]);
-      p += l + 16;
+      map.insert(k,  &b[p+h ..p+h+l]);
+      p += l + h;
    }
 
    map