Allessandro,

> Try a 'print it' of this:
[...]
> And after this,try to read the 'ascii.txt' file with BlockNotes(Win95).
> 
> If you compare the content of BlockNotes to the content of a, you will find
> a big difference.
> 	WHY?

Because of the differences in the character sets used (Note: This is
determined by the *look* of the bitmaps describing certain characters).
Squeak uses a Mac Roman character set whereas Windows uses an Ascii
character set. While the first 127 characters are the same, the mapping of
everything starting from 128 is fairly different.

> How can I avoid this difference and all the consequent problems?

You can use a character translation table. There is  one in
sqWin32Window.c mapping from Win to Squeak. It looks as follows

{
  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
 96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
173,176,226,196,227,201,160,224,246,228,178,220,206,179,182,183,
184,212,213,210,211,165,208,209,247,170,185,221,207,186,189,217,
202,193,162,163,219,180,195,164,172,169,187,199,194,197,168,248,
161,177,198,215,171,181,166,225,252,218,188,200,222,223,240,192,
203,231,229,204,128,129,174,130,233,131,230,232,237,234,235,236,
245,132,241,238,239,205,133,249,175,244,242,243,134,250,251,167,
136,135,137,139,138,140,190,141,143,142,144,145,147,146,148,149,
253,150,152,151,153,155,154,214,191,157,156,158,159,254,255,216
};

and is used to translate the input characters in the VM. The reverse table
(e.g., mapping from Squeak to Win) can be created by

  | squeakToWinTable |
  squeakToWinTable _ ByteArray new: 256.
  1 to: 256 do:[:i|
   squeakToWinTable at: (winToSqueakTable at: i)+1 put: i-1].

Hope this helps.
  Andreas
-- 
Linear algebra is your friend - Trigonometry is your enemy.
+===== Andreas Raab ============= (raab at isg.cs.uni-magdeburg.de) =====+
I Department of Simulation and Graphics      Phone: +49 391 671 8065  I
I University of Magdeburg, Germany           Fax:   +49 391 671 1164  I
+=============< http://isgwww.cs.uni-magdeburg.de/~raab >=============+