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 C H A N G E   L O G
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0.5: Nov 20, 2008

    - Fix bugs in mixasm.pl
    - Add tape/disk timing and seek
    - Add three more mixal programs
    - Add mixsim.pl to combine mixasm and mixsim
	
0.4: May 22, 2008

    - Performance improve, nearly 4 times
    - document

0.3: Feb 28, 2008

    - Fix unasm bug CMP? not handled
    - Fix MIX.pm: our deprecated, add document

0.2: Feb 27, 2008

    - Add unasm in mixsim.pl
    - Add print machine status
    - Remove the print_all_regs in MIX.pm

0.10: Feb 24, 2008

    - Add CON support for mixasm.pl, parse_w_value

0.09: Feb 17, 2008

    - Fix bug: mixasm.pl: no TRANS card if no end of line after "END
      START"

    - Add feature: show execution count and time for
      instrunctions in the 'd' command


0.08: Feb 07, 2008

    - Fix a timing bug in wait_until_device_ready (+=)

0.07: Feb 06, 2008

    - Add timing

0.06: Jan 14, 2007

    - Add disk and tape support
    - rewrite io device management

0.05: Dec 13, 2006

    - support full instructions
    - support only part of the io devices(card reader/punch, printer)

0.04: 
    - Apr. 2006: mixsim.pl: add a command line user interface
               : mixasm.pl: add generate code 

    - Nov. 2006: create test cases; fix some bugs

0.03: add mixasm.pl
0.02: add load operations, display registers and flags
0.01: basic reset, only halt instruction