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diff --git a/matita/matita/contribs/ng_assembly2/emulator/read_write/fetch_base.ma b/matita/matita/contribs/ng_assembly2/emulator/read_write/fetch_base.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* ********************************************************************** *)
+(*                          Progetto FreeScale                            *)
+(*                                                                        *)
+(*   Sviluppato da: Ing. Cosimo Oliboni, oliboni@cs.unibo.it              *)
+(*   Sviluppo: 2008-2010                                                  *)
+(*                                                                        *)
+(* ********************************************************************** *)
+
+include "emulator/translation/translation.ma".
+
+(* errori possibili nel fetch OPCODE / ILLEGAL ADDRESS *)
+ninductive error_type : Type ≝
+  ILL_OP: error_type
+| ILL_FETCH_AD: error_type
+.
+
+(* - errore: interessa solo l'errore
+   - ok: interessa info, nuovo pc *)
+ninductive fetch_result (A:Type) : Type ≝
+  FetchERR : error_type → fetch_result A
+| FetchOK  : A → word16 → fetch_result A.
+
+ndefinition fetch_byte_aux ≝
+λm:mcu_type.λcur_pc:word16.λbh:byte8.
+ match full_info_of_word16 m (Byte bh) with
+  [ None ⇒ FetchERR ? ILL_FETCH_AD
+  | Some info ⇒ FetchOK ? info cur_pc
+  ].
+
+ndefinition fetch_word_aux ≝
+λm:mcu_type.λcur_pc:word16.λw:word16.
+ match full_info_of_word16 m (Word w) with
+  [ None ⇒ FetchERR ? ILL_FETCH_AD
+  | Some info ⇒ FetchOK ? info cur_pc
+  ].