From: John Stone (
Date: Mon Mar 12 2001 - 17:46:34 CST

Dear VMD-L,
  We have just made VMD 1.6.1a3 available for download.
This new version contains 4 new bug fixes since alpha 2,
and is the first release of the new 64-bit versions of VMD
for IRIX and Solaris. The new 64-bit versions allow you to
load trajectory files which are larger than 2GB (gigabytes),
and provide 64-bit memory addressing so that on an appropriately
configured machine, very large molecules or trajectory files
requiring more than 4GB can be loaded and manipulated. A complete
list of updates since the most recent production version VMD 1.6,
is listed below. Your suggestions and feedback are welcome.

Thanks for using VMD!
  John Stone

What's new in VMD 1.6.1?
  New Features
    o Some builds of VMD now support multiprocessor acceleration and
      multithreading for improved I/O performance even on uniprocessors.
    o Multithreaded IMD socket I/O for improved performance on high latency
      networks and with slow simulations.
    o Support for 64-bit versions of VMD on IRIX 6.x and Solaris 2.x,
      using R10000 class SGI CPUs, and UltraSPARC class Sun CPUs.
      The 64-bit versions are capable of working with files larger than
      2GB, and can use more than 4GB of main memory if necessary.
    o New "getbonds" and "setbonds" commands for Tcl and Python
      atom selections. Replaces older "bond" command.

  General Improvements and Bug Fixes
    o Tcl "atomselect get" speed increased by 10-30x for large molecules for
      numeric selections. String-based selections slightly slower, but
      a good improvement for the common performance intensive use-cases.
    o Increased speed of "lines" representation drawing and animation by
      a factor of 3, allowing interactive rotation of huge systems in lines
      mode (4 million atom water box at 2 seconds per frame.)
    o Increased the number of colors in the color scale map from 16 to 1024.
    o Fixed PRs (bugs): 134, 136, 139, 140, 141, 145, 146,
                        148, 150, 151, 152
    o Fixed a minor EOF failure in G96 file reader

  User Interface Changes
    o the rmsd fit routines can be brought up without needing to source
      a fully qualified pathname in the VMD installation directory

  User Documentation Updates
    o Documented new RMSD fit startup feature

NIH Resource for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
Email:                 Phone: 217-244-3349              
  WWW:      Fax: 217-244-6078