Private Sub Поле0_KeyPress(KeyAscii As Integer)
    Select Case KeyAscii
    Case Asc("A") To Asc("Z"), Asc("a") To Asc("z")
        KeyAscii = Asc(Replace_letters(Chr(KeyAscii)))
    Case Else
    End Select
End Sub

'где Replace_letters откель то взято
Private Function Replace_letters(ByVal InputStr As String) As String
Dim enStr As String, rusStr As String
enStr = "@#$^&QWERTYUIOP{}ASDFGHJKL:" & Chr(34) & "ZXCVBNM<>?qwertyuiop[]asdfghjkl;'zxcvbnm,./" & Chr(34) & "№;:?ЙЦУКЕНГШЩЗХЪФЫВАПРОЛДЖЭЯЧСМИТЬБЮ,йцукенгшщзхъфывапролдэжячсмитьбю."
rusStr = Chr(34) & "№;:?ЙЦУКЕНГШЩЗХЪФЫВАПРОЛДЖЭЯЧСМИТЬБЮ,йцукенгшщзхъфывапролджэячсмитьбю." & "@#$^&QWERTYUIOP{}ASDFGHJKL:" & Chr(34) & "ZXCVBNM<>?qwertyuiop[]asdfghjkl;'zxcvbnm,./"
Dim i As Long, pos As Integer, temp As String
For i = 1 To Len(InputStr)
temp = Mid$(InputStr, i, 1)
pos = InStr(1, enStr, temp, vbBinaryCompare)
If pos <> 0 Then
Replace_letters = Replace_letters & Mid$(rusStr, pos, 1)
Else
Replace_letters = Replace_letters & temp
End If
Next i
End Function