diff --git a/hw2/bin/simulator.ml b/hw2/bin/simulator.ml
index 5d01c8d..03cc72d 100644
--- a/hw2/bin/simulator.ml
+++ b/hw2/bin/simulator.ml
@@ -169,7 +169,14 @@ let ( >=. ) a b = Int64.compare a b >= 0
 
 (* Interpret a condition code with respect to the given flags. *)
 (* !!! Check the Specification for Help *)
-let interp_cnd { fo; fs; fz } : cnd -> bool = fun x -> failwith "interp_cnd unimplemented"
+let interp_cnd { fo; fs; fz } : cnd -> bool = fun c ->
+  match c with
+  | Eq -> fz
+  | Neq -> not fz
+  | Gt -> fo = fs && not fz
+  | Ge -> fo = fs
+  | Lt -> fo <> fs
+  | Le -> fo <> fs || fz
 
 (* Maps an X86lite address into Some OCaml array index,
    or None if the address is not within the legal address space. *)