diff --git a/erlang/apps/sim/src/sim_core.erl b/erlang/apps/sim/src/sim_core.erl
index 868fb83..e1aa2ac 100644
--- a/erlang/apps/sim/src/sim_core.erl
+++ b/erlang/apps/sim/src/sim_core.erl
@@ -377,6 +377,10 @@ dispatch(Core, Mem, IR, EA) ->
     8#571 -> sim_halfword:handle_HRREI(Core, Mem, IR, EA);
     8#572 -> sim_halfword:handle_HRREM(Core, Mem, IR, EA);
     8#573 -> sim_halfword:handle_HRRES(Core, Mem, IR, EA);
+    8#574 -> sim_halfword:handle_HLRE(Core, Mem, IR, EA);
+    8#575 -> sim_boolean:handle_SETZ(Core, Mem, IR, EA); % HLREI = HLRZI = SETZ
+    8#576 -> sim_halfword:handle_HLREM(Core, Mem, IR, EA);
+    8#577 -> sim_halfword:handle_HLRES(Core, Mem, IR, EA);
     _ ->
       PC = (Core#core.pc_section bsl 18) bor Core#core.pc_offset,
       {Core, Mem, {error, {?MODULE, {dispatch, PC, IR, EA}}}}
diff --git a/erlang/apps/sim/src/sim_halfword.erl b/erlang/apps/sim/src/sim_halfword.erl
index 71c0147..3adce1f 100644
--- a/erlang/apps/sim/src/sim_halfword.erl
+++ b/erlang/apps/sim/src/sim_halfword.erl
@@ -39,6 +39,9 @@
         , handle_HLLZM/4
         , handle_HLLZS/4
         , handle_HLR/4
+        , handle_HLRE/4
+        , handle_HLREM/4
+        , handle_HLRES/4
         , handle_HLRI/4
         , handle_HLRM/4
         , handle_HLRO/4
@@ -735,6 +738,42 @@ handle_HLROS(Core, Mem, IR, EA) ->
                           fun(Core1, Mem1) -> ?FUNCTION_NAME(Core1, Mem1, IR, EA) end)
   end.
 
+%% HLRE - Half Word Left to Right, Extend
+
+-spec handle_HLRE(#core{}, sim_mem:mem(), IR :: word(), #ea{})
+      -> {#core{}, sim_mem:mem(), {ok, integer()} | {error, {module(), term()}}}.
+handle_HLRE(Core, Mem, IR, EA) ->
+  case sim_core:c(Core, Mem, EA) of
+    {ok, CE} ->
+      AC = IR band 8#17,
+      Word = set_right_extend(get_left(CE)),
+      sim_core:next_pc(sim_core:set_ac(Core, AC, Word), Mem);
+    {error, Reason} ->
+      sim_core:page_fault(Core, Mem, ea_address(EA), read, Reason,
+                          fun(Core1, Mem1) -> ?FUNCTION_NAME(Core1, Mem1, IR, EA) end)
+  end.
+
+-spec handle_HLREM(#core{}, sim_mem:mem(), IR :: word(), #ea{})
+      -> {#core{}, sim_mem:mem(), {ok, integer()} | {error, {module(), term()}}}.
+handle_HLREM(Core, Mem, IR, EA) ->
+  AC = IR band 8#17,
+  CA = sim_core:get_ac(Core, AC),
+  Word = set_right_extend(get_left(CA)),
+  handle_writeback(Core, Mem, EA, Word).
+
+-spec handle_HLRES(#core{}, sim_mem:mem(), IR :: word(), #ea{})
+      -> {#core{}, sim_mem:mem(), {ok, integer()} | {error, {module(), term()}}}.
+handle_HLRES(Core, Mem, IR, EA) ->
+  case sim_core:c(Core, Mem, EA) of
+    {ok, CE} ->
+      AC = IR band 8#17,
+      Word = set_right_extend(get_left(CE)),
+      handle_writeback(Core, Mem, AC, EA, Word);
+    {error, Reason} ->
+      sim_core:page_fault(Core, Mem, ea_address(EA), read, Reason,
+                          fun(Core1, Mem1) -> ?FUNCTION_NAME(Core1, Mem1, IR, EA) end)
+  end.
+
 %% Miscellaneous ===============================================================
 
 handle_writeback(Core, Mem, EA, Word) ->
diff --git a/erlang/apps/sim/test/sim_halfword_tests.erl b/erlang/apps/sim/test/sim_halfword_tests.erl
index 91d230b..045c561 100644
--- a/erlang/apps/sim/test/sim_halfword_tests.erl
+++ b/erlang/apps/sim/test/sim_halfword_tests.erl
@@ -105,6 +105,10 @@
 -define(OP_HRREI, 8#571).
 -define(OP_HRREM, 8#572).
 -define(OP_HRRES, 8#573).
+-define(OP_HLRE,  8#574).
+-define(OP_HLREI, 8#575).
+-define(OP_HLREM, 8#576).
+-define(OP_HLRES, 8#577).
 
 %% 2.8 Half-Word Data Transmission =============================================
 
@@ -999,6 +1003,64 @@ hlros_no_ac_test() ->
          , {#ea{section = 1, offset = 0, islocal = false}, ?COMMA2(1, 0)} % AC0 = 1,,1
          ]).
 
+%% HLRE - Half Word Left to Right, Extend
+
+hlre_test() ->
+  Prog =
+    [ {1, 8#100, ?INSN(?OP_MOVEI, 1, 0, 0, 1)}     % 1,,100/ MOVEI 1,1
+    , {1, 8#101, ?INSN(?OP_HLRE, 1, 0, 0, 8#200)}  % 1,,101/ HLRE 1,200
+    , {1, 8#102, ?INSN_INVALID}                    % 1,,102/ <invalid>
+    , {1, 8#200, ?COMMA2(8#400000, 0)}             % 1,,200/ 400000,,0
+    ],
+  expect(Prog, [], {1, 8#102}, ?DEFAULT_FLAGS,
+         [ {#ea{section = 1, offset = 1, islocal = false}, ?COMMA2(-1, 8#400000)} % AC1 = -1,,400000
+         ]).
+
+hlrei_test() ->
+  Prog =
+    [ {1, 8#100, ?INSN(?OP_MOVEI, 1, 0, 0, 1)}     % 1,,100/ MOVEI 1,1
+    , {1, 8#101, ?INSN(?OP_HLREI, 1, 0, 0, 1)}     % 1,,101/ HLREI 1,1
+    , {1, 8#102, ?INSN_INVALID}                    % 1,,102/ <invalid>
+    ],
+  expect(Prog, [], {1, 8#102}, ?DEFAULT_FLAGS,
+         [ {#ea{section = 1, offset = 1, islocal = false}, ?COMMA2(0, 0)} % AC1 = 0,,0
+         ]).
+
+hlrem_test() ->
+  Prog =
+    [ {1, 8#100, ?INSN(?OP_MOVSI, 1, 0, 0, 1)}     % 1,,100/ MOVSI 1,1
+    , {1, 8#101, ?INSN(?OP_HLREM, 1, 0, 0, 8#200)} % 1,,101/ HLREM 1,200
+    , {1, 8#102, ?INSN_INVALID}                    % 1,,102/ <invalid>
+    , {1, 8#200, ?COMMA2(1, 0)}                    % 1,,200/ 1,,0
+    ],
+  expect(Prog, [], {1, 8#102}, ?DEFAULT_FLAGS,
+         [ {#ea{section = 1, offset = 8#200, islocal = false}, ?COMMA2(0, 1)} % C(1,,200) = 0,,1
+         ]).
+
+hlres_ac_test() ->
+  Prog =
+    [ {1, 8#100, ?INSN(?OP_MOVEI, 1, 0, 0, 1)}     % 1,,100/ MOVEI 1,1
+    , {1, 8#101, ?INSN(?OP_HLRES, 1, 0, 0, 8#200)} % 1,,101/ HLRES 1,200
+    , {1, 8#102, ?INSN_INVALID}                    % 1,,102/ <invalid>
+    , {1, 8#200, ?COMMA2(8#400000, 0)}             % 1,,200/ 400000,,0
+    ],
+  expect(Prog, [], {1, 8#102}, ?DEFAULT_FLAGS,
+         [ {#ea{section = 1, offset = 8#200, islocal = false}, ?COMMA2(-1, 8#400000)} % C(1,,200) = -1,,400000
+         , {#ea{section = 1, offset = 1, islocal = false}, ?COMMA2(-1, 8#400000)} % AC1 = -1,,400000
+         ]).
+
+hlres_no_ac_test() ->
+  Prog =
+    [ {1, 8#100, ?INSN(?OP_MOVSI, 0, 0, 0, 1)}     % 1,,100/ MOVSI 0,1
+    , {1, 8#101, ?INSN(?OP_HLRES, 0, 0, 0, 8#200)} % 1,,101/ HLRES 0,200
+    , {1, 8#102, ?INSN_INVALID}                    % 1,,102/ <invalid>
+    , {1, 8#200, ?COMMA2(1, 0)}                    % 1,,200/ 1,,0
+    ],
+  expect(Prog, [], {1, 8#102}, ?DEFAULT_FLAGS,
+         [ {#ea{section = 1, offset = 8#200, islocal = false}, ?COMMA2(0, 1)} % C(1,,200) = 0,,1
+         , {#ea{section = 1, offset = 0, islocal = false}, ?COMMA2(1, 0)} % AC0 = 1,,0
+         ]).
+
 %% Common code to run short sequences ==========================================
 
 expect(Prog, ACs, ExpectedPC, ExpectedFlags, ExpectedEs) ->