VTM2 is the "Virtual Turing Machine 2" by Paul Ming,
 http://infohost.nmt.edu/~prcm/turing/vtm-2.02.tar.gz

 Here's how I set it up to run here, running under perl 5.8.3
 
 First, vtm* wasn't behaving as I expected 
 ... so I made some changes; see vtm_WITH_JIMS_CHANGES

  $ wget http://infohost.nmt.edu/~prcm/turing/vtm-2.02.tar.gz
  $ tar zxf vtm-2.02.tar.gz
  $ cd vtm-2.02
  $ pod2html VTM.pm > ../VTM_pod.html; rm *.tmp; mv
  $ ./vtm -h > ../vtm_help.txt
  $ make vtml          (c wrapper with path to vtm as /usr/local/bin/vtm)

  # install VTM.pm and vtm*
  $ su
  $ cp ../vtm_WITH_JIMS_CHANGES /usr/local/bin/vtm
  $ cp vtml /usr/local/bin
  $ cp VTM.pm /usr/lib/perl5/site_perl/5.8.3
  $ exit
  
  $ cd ..
  $ mkdir machines
  $ cp -r vtm-2.02/examples/ machines/
  $ cd machines/examples/
  $ perl -pi -e "s{/home/prcm/turing/vtml}{/usr/local/bin/vtml}" *.vtm

 Here's the examples, copied and slightly altered in machines/examples :

  $ ./add.vtm
  This script adds two numbers.  The format of the tape is:

	_1...1_1...1_

  where 1...1 is a string of 1s.  The first string of 1s represents the
  first number in unary, i.e., the number n is represented by a string of
  (n + 1) 1s (e.g. 2 is represented by `111').  The second string of 1s
  represents the second number in unary.  The `_' in the middle separates 
  the numbers.  So an initial tape of `_111_111_' will add 2 and 2, and 
  hopefully get `_11111___' (`11111' is 4 in unary).

  Specify initial tape: _1_11_
     0:  _<1>_ 1 1 _ : pass_first
     0:  _<1>_ 1 1 _ : pass_first
     0:  _ 1<_>1 1 _ : pass_first
     0:  _ 1<1>1 1 _ : pass_second
     0:  _ 1 1<1>1 _ : pass_second
     0:  _ 1 1<1>1 _ : pass_second
     0:  _ 1 1 1<1>_ : pass_second
     0:  _ 1 1 1<1>_ : pass_second
     0:  _ 1 1 1 1<_>: pass_second
     0:  _ 1 1 1 1<_>: delete1
     0:  _ 1 1 1<1>_ : delete1
     0:  _ 1 1 1<_>_ : delete2
     0:  _ 1 1<1>_ _ : delete2
     0:  _ 1 1<_>_ _ : HALT
     0:  _ 1 1 _<_>_ : HALT

  $ ./infinite.vtm 
  This is an example of a Turing machine that has an infinite loop.
  It first goes to the right, then left, then right, then left...
     0: <1>- - : right
     0: <1>- - : right
     0:  1<->- : right
     0:  1<->- : left
     0:  1 -<->: left
     0:  1 -<->: right
     0:  1<->- : right
  Infinite loop detected.  Exiting.
  $