diff --git a/Deliverables/D2.2/8051/src/acc.ml b/Deliverables/D2.2/8051/src/acc.ml
index 0a95ef0..56d0cb9 100644
--- a/Deliverables/D2.2/8051/src/acc.ml
+++ b/Deliverables/D2.2/8051/src/acc.ml
@@ -27,18 +27,20 @@ let process filename =
   let tgt_language = Options.get_target_language () in
   let is_lustre_file = Options.is_lustre_file () in
   let remove_lustre_externals = Options.is_remove_lustre_externals () in
-  let input_ast =
-    Languages.parse ~is_lustre_file ~remove_lustre_externals
-      src_language filename in
-  let input_ast = Languages.add_runtime input_ast in 
-  let input_ast = Languages.labelize input_ast in
   let (exact_output, output_filename) = match Options.get_output_files () with
     | None -> (false, filename)
     | Some filename' -> (true, filename') in
-  let save ?(suffix="") ast = 
-    Languages.save
+  let save ?(suffix="") ?(matita=false) ast = 
+    Languages.save ~matita
       (Options.is_asm_pretty ()) exact_output output_filename suffix ast 
   in
+  let input_ast =
+    Languages.parse ~is_lustre_file ~remove_lustre_externals
+      src_language filename in
+  if tgt_language = Languages.Clight &&
+       Options.is_matita_output_enabled () then save ~matita:true input_ast;
+  let input_ast = Languages.add_runtime input_ast in 
+  let input_ast = Languages.labelize input_ast in
   let target_asts =
     (** If debugging is enabled, the compilation function returns all
 	the intermediate programs. *)
@@ -49,6 +51,8 @@ let process filename =
   in
   let final_ast, intermediate_asts = Misc.ListExt.cut_last target_asts in
   save final_ast;
+  if tgt_language <> Languages.Clight &&
+     Options.is_matita_output_enabled () then save ~matita:true final_ast;
   if Options.annotation_requested () then
     begin
       let (annotated_input_ast, cost_id, cost_incr, extern_cost_variables) =
@@ -59,8 +63,11 @@ let process filename =
 	    extern_cost_variables);
     end;
 
-  if Options.is_debug_enabled () then
+  if Options.is_debug_enabled () then begin
     List.iter save intermediate_asts;
+    if Options.is_matita_output_enabled () then
+      List.iter (save ~matita:true) intermediate_asts
+  end;
 
   if Options.interpretations_requested () then
     begin
diff --git a/Deliverables/D2.2/8051/src/clight/clightFromC.ml b/Deliverables/D2.2/8051/src/clight/clightFromC.ml
index 0b54437..1c84dca 100644
--- a/Deliverables/D2.2/8051/src/clight/clightFromC.ml
+++ b/Deliverables/D2.2/8051/src/clight/clightFromC.ml
@@ -272,6 +272,8 @@ let ezero = Expr(Econst_int(0), Tint(I32, AST.Signed))
 let rec convertExpr env e =
   let ty = convertTyp env e.etyp in
   match e.edesc with
+  | C.EConst(C.CInt(i, _, _)) when i = Int64.zero && ty = Tpointer Tvoid ->
+      Expr(Ecast (ty, Expr (Econst_int 0, Tint (I8, AST.Unsigned))), ty)
   | C.EConst(C.CInt(i, _, _)) ->
       Expr(Econst_int( convertInt i), ty)
   | C.EConst(C.CFloat(f, _, _)) ->
diff --git a/Deliverables/D2.2/8051/src/driver.ml b/Deliverables/D2.2/8051/src/driver.ml
index 759eafd..e0bfd69 100644
--- a/Deliverables/D2.2/8051/src/driver.ml
+++ b/Deliverables/D2.2/8051/src/driver.ml
@@ -4,9 +4,9 @@
 
 module DataSize32 =
 struct
-  let alignment = Some 4
+  let alignment = Some 1
   let int_size = 4
-  let ptr_size = 4
+  let ptr_size = 2
 end
 
 (* The target architecture: the Intel 8051. *)
diff --git a/Deliverables/D2.2/8051/src/languages.ml b/Deliverables/D2.2/8051/src/languages.ml
index 3048d99..ef7b876 100644
--- a/Deliverables/D2.2/8051/src/languages.ml
+++ b/Deliverables/D2.2/8051/src/languages.ml
@@ -257,7 +257,26 @@ let string_output asm_pretty = function
      else ["Pretty print not requested"]) @
     [ASMPrinter.print_program p]
 
-let save asm_pretty exact_output filename suffix ast =
+let string_output_matita = function
+ | AstClight p -> 
+   [ClightPrintMatita.print_program p]
+ | AstCminor p ->
+   [CminorMatitaPrinter.print_program p]
+ | AstRTLabs p ->
+   [RTLabsPrinter.print_program p]
+   (*[RTLabsMatitaPrinter.print_program p]*)
+ | AstRTL p ->
+   [RTLPrinter.print_program p]
+ | AstERTL p ->
+   [ERTLPrinter.print_program p]
+ | AstLTL p ->
+   [LTLPrinter.print_program p]
+ | AstLIN p ->
+   [LINPrinter.print_program p]
+ | AstASM p ->
+   [Pretty.print_program p ; ASMPrinter.print_program p]
+
+let save asm_pretty ?(matita=false) exact_output filename suffix ast =
   let ext_chopped_filename =
     if exact_output then filename 
     else
@@ -265,12 +284,16 @@ let save asm_pretty exact_output filename suffix ast =
       with Invalid_argument ("Filename.chop_extension") -> filename in
   let ext_chopped_filename = ext_chopped_filename ^ suffix in
   let ext_filenames =
-    List.map (fun ext -> ext_chopped_filename ^ "." ^ ext)
+    List.map (fun ext ->
+        if matita then ext_chopped_filename ^ "." ^ ext ^ ".ma"
+                  else ext_chopped_filename ^ "." ^ ext)
       (extension (language_of_ast ast)) in
   let output_filenames =
     if exact_output then ext_filenames
     else List.map Misc.SysExt.alternative ext_filenames in
-  let output_strings = string_output asm_pretty ast in
+  let output_strings =
+    if matita then string_output_matita ast
+              else string_output asm_pretty ast in
   let f filename s =
     let cout = open_out filename in
     output_string cout s;
diff --git a/Deliverables/D2.2/8051/src/languages.mli b/Deliverables/D2.2/8051/src/languages.mli
index 26b5a0f..121c53f 100644
--- a/Deliverables/D2.2/8051/src/languages.mli
+++ b/Deliverables/D2.2/8051/src/languages.mli
@@ -90,7 +90,7 @@ val interpret : bool -> ast -> AST.trace
     whose extension is deduced from the language of the AST. If [exact_output]
     is false then the written file will be fresh. If [asm_pretty] is true, then
     an additional pretty-printed assembly file is output. *)
-val save : bool -> bool -> string -> string -> ast -> unit
+val save : bool -> ?matita:bool -> bool -> string -> string -> ast -> unit
 
 (** [save_cost exact_name filename cost_id cost_incr extern_cost_variables]
     prints the name [cost_id] of the cost variable, then the name [cost_incr] of
diff --git a/Deliverables/D2.2/8051/src/options.ml b/Deliverables/D2.2/8051/src/options.ml
index 77a7735..b4a2d05 100644
--- a/Deliverables/D2.2/8051/src/options.ml
+++ b/Deliverables/D2.2/8051/src/options.ml
@@ -98,6 +98,9 @@ let set_lustre_test_max_int     = (:=) lustre_test_max_int
 let get_lustre_test_max_int () 	= !lustre_test_max_int
 
 
+let matita_flag			= ref false
+let is_matita_output_enabled () = !matita_flag
+
 (*
 let print_result_flag		= ref false
 let set_print_result		= (:=) print_result_flag
@@ -233,4 +236,7 @@ let options = OptionsParsing.register [
 
   "-dev", Arg.Set dev_test,
   " Playground for developers.";
+
+  "-m", Arg.Set matita_flag,
+  " Output matita term (when available).";
 ]
diff --git a/Deliverables/D2.2/8051/src/options.mli b/Deliverables/D2.2/8051/src/options.mli
index 2f75755..3af36c9 100644
--- a/Deliverables/D2.2/8051/src/options.mli
+++ b/Deliverables/D2.2/8051/src/options.mli
@@ -75,3 +75,6 @@ val is_print_result_enabled : unit -> bool
 
 (** {2 Developers' playground} *)
 val is_dev_test_enabled : unit -> bool
+
+(** {2 Output matita term when available} *)
+val is_matita_output_enabled : unit -> bool