The latest and older releases of DDLab and documentation, under the GNU General Public License -- click to download:
DDLab mirror sites for download:
www.ddlab.org Santa Fe, New Mexico
Univ of Sussex UK

Sept 2024 -- ddlabz12 update -- includes new features described HERE ---- as well as improvements and bug fixes. (Supersedes ddlabz08 Feb 20213 and ddlabz12). Readme files for compiled downloads: dd_linux_readme_z12.txt dd_RPI_readme_z12.txt dd_mac_readme_z122txt dd_cygwin_readme_z12.txt dd_DOS_readme_z12.txt

ddlabz12 Sept update compiled downloads:
ddlabz12_linux.tar.gz -- Linux 64-bit (Ubuntu 18.04) -- 0.74M
ddlabz12-RPI-Debian12-64.tar.gz -- RPI 64-bit (Raspberry Pi 400)) -- 0.65M
ddlabz12-RPI-Debian12-32.tar.gz -- RPI 32-bit (Raspberry Pi 400)) -- 0.69M
ddlabz12_Mac_Monteray.tar.gz -- MacOSX Monterey 12.7.6 iMac -- 0.64M
ddlabz12_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.58M
ddlabz12_dos32.tar.gz -- run in DosBox, compiled in Windows 7, 32 bit -- 0.89M


Extra files:
ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6) /b>
fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M


ddlabz12 Sept update Source code, readme:
ddcode-z12-Sept2024.tar.gz -- 0.59M
ddlab_code_Sept2024_z12_readme.txt


ddlabz12 Sept update Makefiles:
Makefile_linux_z12 (also works for RPI and Cygwin)
Makefile_MacOSX_Monterey_z12


Sept 2023 -- ddlabz11 update -- includes new features described HERE ---- as well as improvements and bug fixes. (Supersedes ddlabz08 Feb 2021, and ddlabz11 Aug 2023). Readme files for compiled downloads: dd_linux_readme_z11.txt dd_mac_readme_z11.txt dd_cygwin_readme_z11.txt dd_DOS_readme_z11.txt

ddlabz11 Sept update compiled downloads:
ddlabz11_linux.tar.gz -- Linux 64-bit (Ubuntu 18.04) -- 0.74M
ddlabz11_RaspberryPi32.tar.gz -- Kali Linux 32-bit -- 0.70M
ddlabz11_Mac_Catalina.tar.gz -- MacBook macOS Catalina Version 10.15.7 -- 0.64M
      This compile also works on other Macs as follows (tested by Genaro Martinez -- thanks!)
      minimac macOS Monterey 12.6.7 and 12.7.2, mac book pro macOS Mojave 10.14.6
ddlabz11_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.58M
ddlabz11_dos32.tar.gz -- run in DosBox, compiled in Windows 7, 32 bit -- 0.89M


ddlabz11 compiled downloads (to be updated):
ddlabz11_MacPB32.tar.gz -- Mac PowerBook Mac OS X 10.4.11 (a bit antique, 32bit) -- 0.68M (Aug update)

Extra files:
ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6) -- updated
fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M


ddlabz11 Sept update Source code, readme:
ddcode-z11-Sept2023.tar.gz -- 0.59M
ddlab_code_Sept2023_z11_readme.txt


ddlabz11 Sept update Makefiles:
Makefile_linux_z11
Makefile-MacOSX-Monterey_z11
Makefile_MacPro_SnowLeopard_MacOSX_z11
Makefile_MacOS_Catalina_z11
Makefile_macPB_z11

Feb 2021 -- ddlabz07 update -- includes new features described HERE ---- as well as improvevements and bug fixes. (Supersedes ddlabz07, Nov 2018). Readme files for compiled downloads: dd_linux_readme_z08.txt dd_mac_readme_z08.txt dd_cygwin_readme_z08.txt dd_dos_readme_z08.txt

ddlabz08 compiled downloads:
ddlabz08_linux.tar.gz -- Linux 64-bit (Ubuntu 16.04) -- 0.71M
ddlabz08_iMac_macOSSierra.tar.gz -- iMac macOSSierra 10.12.6 (64bit) -- 0.62M
ddlabz08_MacPro_SnowLeopard.tar.gz -- MacBook for SnowLeopard Mac OSX 10.6 (64bit) -- 0.68M
ddlabz08_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.57M
ddlabz08_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.88M


Extra files:
ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6) -- updated
fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M


ddlabz08 Source code, readme:
ddcode-z08-Feb2021.tar.gz -- 0.53M
ddlab_code_Feb2021_z08_readme.txt
DOS_Watcom_compile_notes_z08.txt


ddlabz08 Makefiles:
Makefile_linux_z08
Makefile-iMac-macOSSierra_z08
Makefile-MacPro-SnowLeopard-MacOSX_z08

November 2018 -- ddlabz07 update -- includes new features described HERE ---- as well as improvevements and bug fixes. (Supersedes ddlabz06, Jan 2018). Readme files for compiled downloads: dd_linux_readme_z07.txt dd_pi_readme_z07.txt dd_mac_readme_z07.txt dd_cygwin_readme_z07.txt dd_dos_readme_z07.txt

ddlabz07 compiled downloads:
ddlabz07_linux64.tar.gz -- Linux 64-bit (Ubuntu 16.04) -- 0.69M
ddlabz07_linux32.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.51M
ddlabz07_pi32.tar.gz -- Linux 32-bit (Raspbian 4.14) -- 0.51M
ddlabz07_macHighSierra.tar.gz -- MacBook macOS High Sierra Version 10.13.6 (intel 64bit) -- 0.61M
ddlabz07_MacPB.tar.gz -- Mac PowerBook OSX 10.4.11 (Motorola 32-bit) -- 0.63M
ddlabz07_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.56M
ddlabz07_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.86M


Extra files:
ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6) -- updated
fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M


ddlabz07 Source code, readme:
ddcode-z07-Nov2018.tar.gz -- 0.53M
ddlab_code_Nov2018_z07_readme.txt
DOS_Watcom_compile_notes_z07.txt


ddlabz07 Makefiles:
Makefile_linux_z07
Makefile_RaspberryPi3_z07
Makefile_SunSarcSolaris_z07
Makefile_maccHighSierra_z07
Makefile_mac_z07 (for most mac systems)
Makefile_mac_PowerBook_z07
Makefile_mac_ElCapitan_z07
Makefile_mac_Sierra_z07
Makefile_mac_SnowLeopard_z07


January 2018 -- ddlabz06 update -- includes new features described HERE ---- as well as improvevements and bug fixes. (Supersedes ddlabz06, March 2017). Readme files for compiled downloads: dd_linux_readme_z06.txt dd_mac_readme_z06.txt dd_cygwin_readme_z06.txt dd_dos_readme_z06.txt

ddlabz06 compiled downloads:
ddlabz06_linux64.tar.gz -- Linux 64-bit (Ubuntu 16.04) -- 0.69M
ddlabz05_linux32.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.51M
ddlabz05_macPowerBook32.tar.gz -- Mac 32-bit (PowerPC G4 OSX 10.4.11) -- 0.64M
ddlabz06_macElCapitan64.tar.gz -- Mac 64-bit (MacBook OSX 10.11.15 (XQuartz 2.7.9) -- 0.61M
ddlabz06_macSnowLeopard64.tar.gz -- Mac 64-bit (OSX 10.6.8) -- 0.66M
ddlabz06_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.55M
ddlabz05_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.71M


Extra files:
ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6)
fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M


ddlabz06 Source code, readme:
ddcode-z06-Jan2018.tar.gz -- 0.53M
ddlab_code_Jan2018_z06_readme.txt
DOS_Watcom_complile_notes_z06.txt
dd_cygwin_readme_z06.txt


ddlabz06 Makefiles:
Makefile_linux_z06
Makefile_RaspberryPi3_z06
Makefile_SunSarcSolaris_z06
Makefile_mac_z06 (for most mac systems)
Makefile_mac_PowerBook_z06
Makefile_mac_ElCapitan_z06
Makefile_mac_Sierra_z06
Makefile_mac_SnowLeopard64_z06
dd_cygwin_readme_z06.txt (includes compile notes)
DOS_Watcom_complile_notes_z06.txt


• March 2017 -- ddlabz05 update, which includes new features described
  here as well as improvevements and bug fixes.
  (Supersedes ddlabz04, May 2016).
  

  Readme files for compiled downloads:
  dd_linux_readme_z05.txt
  dd_mac_readme_z05.txt
  

  ddlabz05 compiled downloads:
  ddlabz05_linux64.tar.gz -- Linux 64-bit (Ubuntu 11.04) -- 0.64M
  ddlabz05_linux32.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.49M
  ddlabz05_macPowerBook32.tar.gz -- Mac 32-bit (PowerPC G4 OSX 10.4.11) -- 0.62M ddlabz05_macElCapitan64.tar.gz -- Mac 64-bit (MacBook OSX 10.11.15 (XQuartz 2.7.9) -- 0.59M
  ddlabz05_macSierra64.tar.gz -- Mac 64-bit (OSX 10.12) -- 0.59M
  ddlabz05_macSnowLeopard64.tar.gz -- Mac 64-bit (OSX 10.6.8) -- 0.63M
  

  Extra files:
  ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6)
  fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M
  

  ddlabz05 Source code, readme, Makefiles:
  ddlab_codez05_March2017.tar.gz
  ddlab_code_March2017_z05_readme.txt
  Makefile_linux_z05
  Makefile_mac_z05
  Makefile_ElCapitan_mac_z05
  Makefile_mac_Sierra_z05
  

  May 2016 -- ddlabz04 update, which includes new features described
  here as well as improvevements and bug fixes.
  (Supersedes ddlabz03, Sep 2015).
  

  Readme files for compiled downloads:
  dd_linux_readme_z04.txt
  dd_mac_readme_z04.txt
  dd_cygwin_readme_z04.txt
  dd_dos_readme_z04.txt

  ddlabz04 compiled downloads:
  ddlabz04_linux64.tar.gz -- Linux 64-bit (Ubuntu 11.04) -- 0.63M
  ddlabz04_linux32.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.47M
  ddlabz04_macPowerBook32.tar.gz -- Mac 32-bit (PowerPC G4 OSX 10.4.11) -- 0.62M ddlabz04_macLeopard32.tar.gz -- Mac 32-bit (iMac Leopard 10.5.8) -- 0.56M
  ddlabz04_macTiger64.tar.gz -- Mac 32-bit (Tiger 10.6.8) -- 0.56M
  ddlabz04_macYosemite64.tar.gz -- Mac 64-bit (Yosemite 10.10.5) -- 0.57M
  ddlabz04_macCapitan64.tar.gz -- Mac 64-bit (Capitan 10.11.4) -- 0.57M
  ddlabz04_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.52M
  ddlabz04_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.81M

  Extra files:
  ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6)
  fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M
  

  ddlabz04 Source code, readme, Makefiles:
  ddcode_z04_May2016.tar.gz
  ddlab_code_May2016_z04_readme.txt
  Makefile_linux_z04
  Makefile_mac_z04
  Makefile_Yosemite_Mac_z04
  Makefile_Capitan_mac_z04
  DOS_Watcom_compile_notes_z04.txt
  

  Sept 2015 -- ddlabz03 update, which includes new features described
  here as well as improvevement and bug fixes.
  (Supersedes ddlabx11, Sep 2013).
  

  Readme files for compiled downloads:
  dd_linux_readme_z03.txt
  dd_mac_readme_z03.txt
  dd_cygwin_readme_z03.txt
  dd_dos_readme_z03.txt

  ddlabz03 compiled downloads:
  ddlabz03_linux64.tar.gz -- Linux 64-bit (Ubuntu 11.04) -- 0.63M
  ddlabz03_linux32.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.47M
  ddlabz03_macPowerBook32.tar.gz -- Mac 32-bit (PowerPC G4 OSX 10.4.11) -- 0.6M
  ddlabz03_macLeopard32.tar.gz -- Mac 32-bit (iMac Leopard 10.5.8) -- 0.56M
  ddlabz03_macMavericks32.tar.gz -- Mac 32-bit (Mavericks 10.9.4) -- 0.56M
  ddlabz03_macYosemite64.tar.gz -- Mac 32-bit (Yosemite 10.10.5) -- 0.57M
  ddlabz03_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.52M
  ddlabz03_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.81M

  Extra files:
  ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6)
  fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M
  

  Source code, readme, Makefiles:
  ddcode_z03_Sept2015.tar.gz
  ddlab_code_Sept_z03_readme.txt
  Makefile_linux_z03
  Makefile_mac_z03
  DOS_Watcom_compile_notes_z03.txt
  

  June 2013 -- ddlabx11 update, which includes
  

  1. Jan: Null Boundary Conditions
     New 2d hex/triangular neighbourhoods for k3 and k4.
     
  2. May: Automatic Derrida plots for sets of rules, equivalence classes and rule clusters..
     
  3. June: Network (and jump) graph nodes contract down to 1 pixel -- improving the scolling tube for large 1d networks, improvements to enlarged DDLab window layout, load/save ascii seed files.
     

  (Supersedes ddlabx11, May 2013).
  

  Readme files for compiled downloads:
  dd_linux_readme_x11.txt
  dd_mac_readme_x11.txt
  dd_cygwin_readme_x11.txt
  dd_dos_readme_x11.txt

  ddlabx11 compiled downloads:
  ddlabx11_linux64.tar.gz -- Linux 64-bit (Ubuntu 11.04) -- 0.60M
  ddlabx11_linux32.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.45M
  ddlabx11_macPB32.tar.gz -- Mac 32-bit (PowerPC G4 OSX 10.4.11) -- 0.57M
  ddlabx11_macMB32.tar.gz -- Mac 32-bit (MacBook Pro OSX 10.5.8) -- 0.57M
  ddlabx11_macML32.tar.gz -- Mac 32-bit (Mountain Lion OSX 10.8.2) -- 0.57M
  ddlabx11_cygwin32.tar.gz -- Cygwin/X 32-bit -- 0.50M
  ddlabx11_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.77M

  Extra files:
  ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6)
  fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M
  

  Source code, readme, Makefiles:
  ddcode_x11_May2013.tar.gz
  ddlab_code_June2013_x11_readme.txt
  Makefile_Linux_x11
  Makefile_Mac_x11
  Makefile_Cygwin_x11
  DOS_Watcom_compile_notes_x11.txt
  

  June 2012 -- Two alternative updates, ddlabm08 and ddlabx09, 64-bit for Linux and Mac, 32-bit for Linux, Mac, Cygwin and DOS. Note that 32-bit DDLab runs on a 64-bit system, but not vice versa. More update details are provided here. (* denotes Nov 2012 updates for minor bugs)

  Readme files for compiled downloads:
  dd_linux_readme.txt
  dd_mac_readme.txt
  dd_cygwin_readme.txt
  dd_dos_readme.txt

  ddlabm08compiled downloads:
  (note: if not executable, fix with "chmod +x filename")
  ddlabm08_linux64.gz* -- Linux 64-bit (Ubuntu 11.04) -- 0.61M
  ddlabm08_linux32.gz* -- Linux 32-bit (Ubuntu 6.06) -- 0.46M
  ddlabm08_mac32.gz -- Mac 32-bit (Mac OSX 10.4.11) -- 0.57M
  ddlabm08_cygwin32.exe.gz -- Cygwin/X 32-bit -- 0.52M
  ddlabm08_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.80M

  ddlabx09 compiled downloads:
  (note: if not executable, fix with "chmod +x filename")
  ddlabx09_linux64.gz* -- Linux 64-bit (Ubuntu 11.04) -- 0.60M
  ddlabx09_linux32.gz* -- Linux 32-bit (Ubuntu 6.06) -- 0.45M
  ddlabx09_mac32.gz -- Mac 32-bit (Mac OSX 10.4.11) -- 0.57M
  ddlabx09_cygwin32.exe.gz -- Cygwin/X 32-bit -- 0.50M
  ddlabx09_dos32.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.77M

  Extra files:
  ddextra.tar.gz-- extra files to supplement DDLab (EDD #3.6)
  fonts_dd_linux.tar.gz -- font that may be required for Linux-- 13M
  

  Source code, readme, Makefiles:
  ddcode_m08_June2012.tar.gz*
  ddcode_x09_June2012.tar.gz*
  ddlab_code_June2012_readme.txt
  Makefile_Linux_m08
  Makefile_Linux_x09
  Makefile_Mac_m08
  Makefile_Mac_x09
  Makefile_Cygwin_m08
  Makefile_Cygwin_x09
  DOS_Watcom_compile_notes.txt
  

  Sept 2011 -- major open-source update (ddlabm07) corresponds exactly with Exploring Discrete Dynamics which supersedes the old DDLab manual. Readme files, also included in compiled downloads: dd_linux_readme.txt dd_mac_readme.txt dd_cygwin_readme.txt dd_dos_readme.txt

  Compiled downloads:
  ddlab_linux6_Sept_2011.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.46M
  ddlab_linux11_Sept_2011.tar.gz -- Linux 64-bit (Ubuntu 11.04) -- 0.51M
  ddlab_mac_Sept_2011.tar.gz -- Mac 32-bit (Mac OSX 10.4.11) -- 0.57M
  ddlab_cygwin_Sept_2011.tar.gz -- Cygwin/X 32-bit -- 0.52M
  ddlab_dos_Sept_2011.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.81M

  Extra files:
  ddextra.tar.gz -- extra files to supplement DDLab (EDD #3.6)
  fonts_dd_linux.tar.gz -- font that may be require for Linux-- 13M
  

  Source code under the GNU General Public License:
  ddlab_code_Sept2011_readme.txt
  ddlab_code_Sept2011.tar.gz

• Nov 2008 -- multi-value release. Many small but significant improvements and bug fixes. Vector PostScript is now available for most DDLab graphic output: space-time patterns, attractor basins, network graph and jump graph.

  ddlab_linux_m06.tar.gz -- Linux 32-bit (Ubuntu 6.06) -- 0.45M
  ddlab_mac_m06.tar.gz -- Mac 32-bit (Mac OSX 10.4.11) -- 0.52M
  ddlab_cygwin_m06.tar.gz -- Cygwin/X 32-bit-- 0.51M
  ddlab_dos_m06.tar.gz -- DOS 32-bit (WatcomC 11) -- 0.8M

• Nov 2005 -- multi-value release -- see new features Dec 2004.
  New features include: outer-totalistic rules, Reaction-Diffusion dynamics (excitable media), scrolling 2d space-time patterns, and other new options, improvements, revisions and bug fixes.

  The ddlab files, and the files in dd_extra.tar.gz, should be in the same directory.
  ddlab_linux_m05.tar.gz -- Linux -- 0.49M
  ddlab_unix_m05.tar.gz -- UNIX/XWindows -- 0.47M
  ddlab_irix_m05.tar.gz -- IRIX -- 0.73M
  ddlab_mac_m05.tar.gz -- Mac -- 0.53M
  ddlab_cygwin_m05.tar.gz -- Cygwin/X -- 0.48M
  ddlab_dos_m05.tar.gz -- DOS -- 0.77M
  dd_extra.tar.gz -- extra files -- 1.67M

• Dec 2003 -- the first multi-value release -- see new features Dec 2003.
  This is a major update. The most significant changes were: Generalizing all aspects of DDLab for multi-value logic (up to 8 values or colors), instead of just Boolean logic (0,1).
  Click here for some examples.

  Constraining DDLab to run forward only for two types of totalistic rules, which allows larger neighborhoods (up to k=25). In 2d the neighborhoods are predefined to make both square or hexagonal lattices. Many interesting "life"-like and other complex dynamics can be found in this constrained rule-space in 1d, 2d and 3d, including gliders, gliders-guns, self-replication, spirals and predator-prey dynamics. Some amazing examples are provided. Click here for details and instructions for running these complex rules.

  ddlab_linux_m04.tar.gz -- Linux -- 0.37M
  ddlab_unix_m04.tar.gz -- UNIX/X Windows -- 0.45M
  ddlab_irix_m04.tar.gz -- IRIX -- 0.7M
  ddlab_mac_m04.tar.gz -- Mac -- 0.63M
  ddlab_dos_m04.tar.gz -- DOS -- 0.75
  dd_extra.tar.gz -- extra files -- 1.67M

• May 2002 -- version 24 -- see new features May 2002.
  The manual for binary CA and random Boolean networks (RBN), released in July 2001, corresponds to ths release of DDLab. Click here for an overview, or download the pdf (20M) from the Univ of Sussex, or the Uni of the West of England
  downloads/dd_manual/ddop2001.pdf

  ddlab_linux_24.tar.gz -- for Linux -- 0.95M
  ddlab_unix_24.tar.gz -- UNIX/X Windows -- 0.86M
  ddlab_irix_24.tar.gz -- IRIX -- 1.05M
  ddlab_dos_24.tar.gz -- DOS -- 1.1M

• Feb 1999 -- version 22 --see new features Feb 1999
  dddlab_lnx_22.tar.gz -- Linux -- 0.7M
  ddlab_unx_22.tar.gz -- UNIX/X Windows -- 0.76M
  ddlab_22.zip -- DOS -- 1.05M

• Sept 1997 -- version 21 -- see new features Sept 1997
  ddlabx_linux_21.tar.gz -- Linux -- 0.9M
  ddlabx_21.tar.gz -- UNIX/X Windows -- 0.86M
  ddlab_21.zip -- DOS -- 0.94M

• March 1996 - version 20
  ddlab.txt -- readme -- 6.8K
  ddlab_20.zip -- DOS -- 0.46M
  ddlabx_20.tar.gz -- UNIX/X Windows -- 0.44M

• July 1995 - version 10
  ddlab_10.zip -- DOS including DDLABOP.DOC MSWord manual -- 0.55M
  DDLABOP.DOC -- the MSWord manual -- 0.31M

Documentation:
The latest for ddlabz12 is:
ExploringDiscreteDynamics-updateSept2024.pdf --29M

Exploring Discrete Dynamics - Second Edition (ddlabz04 2016, ddlabz06 2017)

older documentation
Exploring Discrete Dynamics (ddlabm07 2011) reviews

The DDLab Manual (ddlab24 May2002) contents
DDLab Manual (ddlab10 July1995)